zoukankan html css js c++ java

dpdk 内存管理

dpdk 使用 Linux 提供的获取大页、页表、numa 节点表、mmap 功能重新组织内存。

大页：最多可以同时存在 3 种大页。一般只是用 2M 的大页。linux 中获取大页相关信息是通过访问解析 /sys/kernel/mm/hugepages、/proc/meminfo、/proc/mounts 等内容得到的。
页表： linux 中每个进程的页表对应的文件是 /proc/pid/pagemap，本进程的页表是 /proc/self/pagemap。
numa 节点表： linux 中每个物理页所在的 numa socket 表对应的文件是 /proc/pid/numa_maps，本进程的 numa socket 表是 /proc/self/numa_maps。
大页内存：Hugepages详解

[root@localhost simple_mp]#   ./build/simple_mp -l 126-127   --proc-type=primary
EAL: Detected 128 lcore(s)
EAL: Detected 4 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:05:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:200 net_hinic

[root@localhost simple_mp]# ps -elf | grep simple
0 R root      15154 124128 96  80   0 - 8389397 -    05:27 pts/1    00:00:09 ./build/simple_mp -l 126-127 --proc-type=primary
0 S root      15168   7504  0  80   0 -  1729 pipe_w 05:27 pts/2    00:00:00 grep --color=auto simple
[root@localhost simple_mp]# cat /proc/15154/numa_maps
00400000 default file=/data1/dpdk-19.11/examples/multi_process/simple_mp/build/simple_mp mapped=44 N1=44 kernelpagesize_kB=64
00ad0000 default file=/data1/dpdk-19.11/examples/multi_process/simple_mp/build/simple_mp anon=1 dirty=1 mapped=2 N0=1 N1=1 kernelpagesize_kB=64
00af0000 default file=/data1/dpdk-19.11/examples/multi_process/simple_mp/build/simple_mp anon=4 dirty=4 N3=4 kernelpagesize_kB=64
00b30000 default anon=21 dirty=21 N0=15 N3=6 kernelpagesize_kB=64
0ead0000 default heap anon=42 dirty=42 N0=15 N3=27 kernelpagesize_kB=64
100000000 default file=/run/dpdk/rte/config dirty=1 N0=1 kernelpagesize_kB=64
100010000 default file=/run/dpdk/rte/fbarray_memzone dirty=3 N0=3 kernelpagesize_kB=64
100040000 default file=/run/dpdk/rte/fbarray_memseg-524288k-0-0 dirty=1 N0=1 kernelpagesize_kB=64
120000000 default
920000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-0-1 dirty=1 N0=1 kernelpagesize_kB=64
940000000 default
1140000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-1-0 dirty=1 N0=1 kernelpagesize_kB=64
1160000000 default
1960000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-1-1 dirty=1 N0=1 kernelpagesize_kB=64
1980000000 default
2180000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-2-0 dirty=1 N0=1 kernelpagesize_kB=64
21a0000000 default
29a0000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-2-1 dirty=1 N0=1 kernelpagesize_kB=64
29c0000000 default
31c0000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-3-0 dirty=1 N0=1 kernelpagesize_kB=64
31e0000000 default
39e0000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-3-1 dirty=1 N0=1 kernelpagesize_kB=64
3a00000000 default
4200000000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-0 dirty=7 N0=7 kernelpagesize_kB=64
4200200000 default
4600200000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-1 dirty=7 N0=7 kernelpagesize_kB=64
4600400000 default
4a00400000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-2 dirty=7 N0=7 kernelpagesize_kB=64
4a00600000 default
4e00600000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-3 dirty=7 N0=7 kernelpagesize_kB=64
4e00800000 default
5200800000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-0 dirty=7 N0=7 kernelpagesize_kB=64
5200a00000 default
5600a00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-1 dirty=7 N0=7 kernelpagesize_kB=64
5600c00000 default
5a00c00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-2 dirty=7 N0=7 kernelpagesize_kB=64
5a00e00000 default
5e00e00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-3 dirty=7 N0=7 kernelpagesize_kB=64
5e01000000 default
6201000000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-0 dirty=7 N0=7 kernelpagesize_kB=64
6201200000 default
6601200000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-1 dirty=7 N0=7 kernelpagesize_kB=64
6601400000 default
6a01400000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-2 dirty=7 N0=7 kernelpagesize_kB=64
6a01600000 default
6e01600000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-3 dirty=7 N0=7 kernelpagesize_kB=64
6e01800000 default
7201800000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-0 dirty=7 N0=7 kernelpagesize_kB=64
7201a00000 default file=/mnt/huge/rtemap_163840 huge dirty=1 N3=1 kernelpagesize_kB=2048
7201c00000 default file=/mnt/huge/rtemap_163841 huge dirty=1 N3=1 kernelpagesize_kB=2048
7201e00000 default file=/mnt/huge/rtemap_163842 huge dirty=1 N3=1 kernelpagesize_kB=2048
7202000000 default
7601a00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-1 dirty=7 N0=7 kernelpagesize_kB=64
7601c00000 default
7a01c00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-2 dirty=7 N0=7 kernelpagesize_kB=64
7a01e00000 default
7e01e00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-3 dirty=7 N0=7 kernelpagesize_kB=64
7e02000000 default
ffffb8cc0000 default
ffffb8cd0000 default anon=2 dirty=2 N0=1 N3=1 kernelpagesize_kB=64
ffffb94e0000 default
ffffb94f0000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffb9cf0000 default
ffffb9d00000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba500000 default file=/usr/lib64/libgcc_s-4.8.5-20150702.so.1 mapped=1 mapmax=20 N2=1 kernelpagesize_kB=64
ffffba520000 default file=/usr/lib64/libgcc_s-4.8.5-20150702.so.1 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba530000 default file=/usr/lib64/libgcc_s-4.8.5-20150702.so.1 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba540000 default file=/usr/lib64/libc-2.17.so mapped=19 mapmax=31 N2=19 kernelpagesize_kB=64
ffffba6b0000 default file=/usr/lib64/libc-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba6c0000 default file=/usr/lib64/libc-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba6d0000 default file=/usr/lib64/libpthread-2.17.so mapped=2 mapmax=21 N2=2 kernelpagesize_kB=64
ffffba6f0000 default file=/usr/lib64/libpthread-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba700000 default file=/usr/lib64/libpthread-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba710000 default file=/usr/lib64/libdl-2.17.so mapped=1 mapmax=27 N2=1 kernelpagesize_kB=64
ffffba720000 default file=/usr/lib64/libdl-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba730000 default file=/usr/lib64/libdl-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba740000 default file=/usr/lib64/libnuma.so.1.0.0 mapped=1 mapmax=2 N0=1 kernelpagesize_kB=64
ffffba750000 default file=/usr/lib64/libnuma.so.1.0.0 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba760000 default file=/usr/lib64/libnuma.so.1.0.0 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba770000 default file=/usr/lib64/libm-2.17.so mapped=1 mapmax=17 N0=1 kernelpagesize_kB=64
ffffba810000 default file=/usr/lib64/libm-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba820000 default file=/usr/lib64/libm-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba830000 default file=/usr/lib64/librt-2.17.so mapped=1 mapmax=20 N2=1 kernelpagesize_kB=64
ffffba840000 default file=/usr/lib64/librt-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba850000 default file=/usr/lib64/librt-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba860000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba870000 default
ffffba880000 default
ffffba890000 default file=/usr/lib64/ld-2.17.so mapped=2 mapmax=31 N2=2 kernelpagesize_kB=64
ffffba8b0000 default file=/usr/lib64/ld-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffba8c0000 default file=/usr/lib64/ld-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
fffffa700000 default stack anon=1 dirty=1 N0=1 kernelpagesize_kB=64
[root@localhost simple_mp]

[root@localhost simple_mp]# cat /sys/devices/system/node/node0/meminfo
Node 0 MemTotal:       133176640 kB
Node 0 MemFree:        96906880 kB
Node 0 MemUsed:        36269760 kB
Node 0 Active:          1257024 kB
Node 0 Inactive:         387328 kB
Node 0 Active(anon):      73152 kB
Node 0 Inactive(anon):      448 kB
Node 0 Active(file):    1183872 kB
Node 0 Inactive(file):   386880 kB
Node 0 Unevictable:           0 kB
Node 0 Mlocked:               0 kB
Node 0 Dirty:                 0 kB
Node 0 Writeback:             0 kB
Node 0 FilePages:       1580160 kB
Node 0 Mapped:            11712 kB
Node 0 AnonPages:         65536 kB
Node 0 Shmem:              9408 kB
Node 0 KernelStack:       27328 kB
Node 0 PageTables:         4032 kB
Node 0 NFS_Unstable:          0 kB
Node 0 Bounce:                0 kB
Node 0 WritebackTmp:          0 kB
Node 0 Slab:             367936 kB
Node 0 SReclaimable:     110208 kB
Node 0 SUnreclaim:       257728 kB
Node 0 AnonHugePages:         0 kB
Node 0 ShmemHugePages:        0 kB
Node 0 ShmemPmdMapped:        0 kB
Node 0 HugePages_Total:    64
Node 0 HugePages_Free:     64
Node 0 HugePages_Surp:      0
[root@localhost simple_mp]#

[root@localhost simple_mp]# ls -tlr /mnt/huge/
total 6144
-rw-------. 1 root root 2097152 Aug 28 05:27 rtemap_163840
-rw-------. 1 root root 2097152 Aug 28 05:27 rtemap_163842
-rw-------. 1 root root 2097152 Aug 28 05:27 rtemap_163841
[root@localhost simple_mp]#

rte_eal_hugepage_init()主要是在/mnt/huge目录下创建hugetlbfs配置的内存页数（在本文中就是64）的rtemap_xx文件，并为每个rtemap_xx文件做mmap映射，保证mmap后的虚拟地址与实际的物理地址是一样的。

[root@localhost lib]# ps -elf | grep simple
0 S root      15154 124128  7  80   0 - 8389378 wait_w 05:27 pts/1  00:01:36 ./build/simple_mp -l 126-127 --proc-type=primary
0 S root      16221  57486  0  80   0 -  1729 pipe_w 05:48 pts/0    00:00:00 grep --color=auto simple
[root@localhost lib]# kill -9 15154
[root@localhost lib]# ls -ltr /mnt/huge/   // kill 了还存在
total 6144
-rw-------. 1 root root 2097152 Aug 28 05:27 rtemap_163840
-rw-------. 1 root root 2097152 Aug 28 05:27 rtemap_163842
-rw-------. 1 root root 2097152 Aug 28 05:27 rtemap_163841

[root@localhost dpdk-19.11]# ./usertools/dpdk-devbind.py -u 0000:05:00.0
[root@localhost dpdk-19.11]# ./usertools/dpdk-devbind.py --bind=vfio-pci 0000:05:00.0
[root@localhost dpdk-19.11]#  ./examples/kni/build/app/kni -c 0xF -n 4 -- -P -p 0x1 --config="(0,3,1)"
EAL: Detected 128 lcore(s)
EAL: Detected 4 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:05:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:200 net_hinic
EAL:   using IOMMU type 1 (Type 1)
net_hinic: Initializing pf hinic-0000:05:00.0 in primary process

[root@localhost simple_mp]# ls -tlr /mnt/huge
total 12288
-rw-------. 1 root root 2097152 Aug 28 05:59 rtemap_65536
-rw-------. 1 root root 2097152 Aug 28 05:59 rtemap_65537
-rw-------. 1 root root 2097152 Aug 28 05:59 rtemap_65541
-rw-------. 1 root root 2097152 Aug 28 05:59 rtemap_65540
-rw-------. 1 root root 2097152 Aug 28 05:59 rtemap_65539
-rw-------. 1 root root 2097152 Aug 28 05:59 rtemap_65538

[root@localhost simple_mp]# ls /var/run/dpdk/rte/ -lrt
total 8000
srwxr-xr-x. 1 root root      0 Aug 28 05:59 mp_socket
-rw-------. 1 root root  18816 Aug 28 05:59 config
-rw-------. 1 root root  16576 Aug 28 05:59 hugepage_info
-rw-------. 1 root root 196608 Aug 28 05:59 fbarray_memzone
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-3-1
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-3-0
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-2-1
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-2-0
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-1-1
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-1-0
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-0-1
-rw-------. 1 root root  65536 Aug 28 05:59 fbarray_memseg-524288k-0-0
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-3-3
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-3-2
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-3-1
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-3-0
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-2-3
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-2-2
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-2-1
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-2-0
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-1-3
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-1-2
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-1-1
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-1-0
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-0-3
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-0-2
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-0-1
-rw-------. 1 root root 458752 Aug 28 05:59 fbarray_memseg-2048k-0-0
[root@localhost simple_mp]#

[root@localhost simple_mp]# cat /proc/meminfo 
MemTotal:       535414912 kB
MemFree:        395457472 kB
MemAvailable:   356217664 kB
Buffers:           13696 kB
Cached:          2478208 kB
SwapCached:            0 kB
Active:          1958720 kB
Inactive:         718464 kB
Active(anon):     201216 kB
Inactive(anon):    51648 kB
Active(file):    1757504 kB
Inactive(file):   666816 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:               256 kB
Writeback:             0 kB
AnonPages:        187520 kB
Mapped:            60992 kB
Shmem:             67520 kB
Slab:            1339008 kB
SReclaimable:     264896 kB
SUnreclaim:      1074112 kB
KernelStack:       85312 kB
PageTables:         9728 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    200336448 kB
Committed_AS:     549184 kB
VmallocTotal:   133009637312 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:     256
HugePages_Free:      255
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:     524288 kB

[root@localhost simple_mp]# cat  /sys/devices/system/node/node3/meminfo  | grep HugePages_
Node 3 HugePages_Total:    64
Node 3 HugePages_Free:     64
Node 3 HugePages_Surp:      0
[root@localhost simple_mp]# cat  /sys/devices/system/node/node2/meminfo  | grep HugePages_
Node 2 HugePages_Total:    64
Node 2 HugePages_Free:     64
Node 2 HugePages_Surp:      0
[root@localhost simple_mp]# cat  /sys/devices/system/node/node1/meminfo  | grep HugePages_
Node 1 HugePages_Total:    64
Node 1 HugePages_Free:     64
Node 1 HugePages_Surp:      0
[root@localhost simple_mp]# cat  /sys/devices/system/node/node0/meminfo  | grep HugePages_
Node 0 HugePages_Total:    64
Node 0 HugePages_Free:     63
Node 0 HugePages_Surp:      0
[root@localhost simple_mp]#

[root@localhost simple_mp]# cat /proc/17051/m
map_files/  maps        mem         mountinfo   mounts      mountstats  
[root@localhost simple_mp]# cat /proc/17051/maps 
00400000-00ac0000 r-xp 00000000 08:10 22155424                           /data1/dpdk-19.11/examples/kni/build/app/kni
00ad0000-00af0000 r--p 006c0000 08:10 22155424                           /data1/dpdk-19.11/examples/kni/build/app/kni
00af0000-00b30000 rw-p 006e0000 08:10 22155424                           /data1/dpdk-19.11/examples/kni/build/app/kni
00b30000-00d90000 rw-p 00000000 00:00 0 
37d60000-38020000 rw-p 00000000 00:00 0                                  [heap]
100000000-100010000 rw-s 00000000 00:17 128179                           /run/dpdk/rte/config
100010000-100040000 rw-s 00000000 00:17 133227                           /run/dpdk/rte/fbarray_memzone
100040000-100050000 rw-s 00000000 00:17 224017                           /run/dpdk/rte/fbarray_memseg-524288k-0-0
120000000-140000000 rw-s 00000000 00:29 333018                           /dev/hugepages/rtemap_0
140000000-920000000 r--p 00000000 00:00 0 
920000000-920010000 rw-s 00000000 00:17 224018                           /run/dpdk/rte/fbarray_memseg-524288k-0-1
940000000-1140000000 r--p 00000000 00:00 0 
1140000000-1140010000 rw-s 00000000 00:17 224019                         /run/dpdk/rte/fbarray_memseg-524288k-1-0
1160000000-1960000000 r--p 00000000 00:00 0 
1960000000-1960010000 rw-s 00000000 00:17 224020                         /run/dpdk/rte/fbarray_memseg-524288k-1-1
1980000000-2180000000 r--p 00000000 00:00 0 
2180000000-2180010000 rw-s 00000000 00:17 224021                         /run/dpdk/rte/fbarray_memseg-524288k-2-0
21a0000000-29a0000000 r--p 00000000 00:00 0 
29a0000000-29a0010000 rw-s 00000000 00:17 224022                         /run/dpdk/rte/fbarray_memseg-524288k-2-1
29c0000000-31c0000000 r--p 00000000 00:00 0 
31c0000000-31c0010000 rw-s 00000000 00:17 224023                         /run/dpdk/rte/fbarray_memseg-524288k-3-0
31e0000000-39e0000000 r--p 00000000 00:00 0 
39e0000000-39e0010000 rw-s 00000000 00:17 224024                         /run/dpdk/rte/fbarray_memseg-524288k-3-1
3a00000000-4200000000 r--p 00000000 00:00 0 
4200000000-4200070000 rw-s 00000000 00:17 224025                         /run/dpdk/rte/fbarray_memseg-2048k-0-0
4200200000-4200400000 rw-s 00000000 00:2b 332953                         /mnt/huge/rtemap_65536
4200400000-4200600000 rw-s 00000000 00:2b 332954                         /mnt/huge/rtemap_65537
4200600000-4200800000 rw-s 00000000 00:2b 332955                         /mnt/huge/rtemap_65538
4200800000-4200a00000 rw-s 00000000 00:2b 332956                         /mnt/huge/rtemap_65539
4200a00000-4200c00000 rw-s 00000000 00:2b 332957                         /mnt/huge/rtemap_65540
4200c00000-4200e00000 rw-s 00000000 00:2b 332958                         /mnt/huge/rtemap_65541
4200e00000-4600200000 r--p 00000000 00:00 0 
4600200000-4600270000 rw-s 00000000 00:17 224026                         /run/dpdk/rte/fbarray_memseg-2048k-0-1
4600400000-4a00400000 r--p 00000000 00:00 0 
4a00400000-4a00470000 rw-s 00000000 00:17 224027                         /run/dpdk/rte/fbarray_memseg-2048k-0-2
4a00600000-4e00600000 r--p 00000000 00:00 0 
4e00600000-4e00670000 rw-s 00000000 00:17 224028                         /run/dpdk/rte/fbarray_memseg-2048k-0-3
4e00800000-5200800000 r--p 00000000 00:00 0 
5200800000-5200870000 rw-s 00000000 00:17 224029                         /run/dpdk/rte/fbarray_memseg-2048k-1-0
5200a00000-5600a00000 r--p 00000000 00:00 0 
5600a00000-5600a70000 rw-s 00000000 00:17 224030                         /run/dpdk/rte/fbarray_memseg-2048k-1-1
5600c00000-5a00c00000 r--p 00000000 00:00 0 
5a00c00000-5a00c70000 rw-s 00000000 00:17 224031                         /run/dpdk/rte/fbarray_memseg-2048k-1-2
5a00e00000-5e00e00000 r--p 00000000 00:00 0 
5e00e00000-5e00e70000 rw-s 00000000 00:17 224032                         /run/dpdk/rte/fbarray_memseg-2048k-1-3
5e01000000-6201000000 r--p 00000000 00:00 0 
6201000000-6201070000 rw-s 00000000 00:17 224033                         /run/dpdk/rte/fbarray_memseg-2048k-2-0
6201200000-6601200000 r--p 00000000 00:00 0 
6601200000-6601270000 rw-s 00000000 00:17 224034                         /run/dpdk/rte/fbarray_memseg-2048k-2-1
6601400000-6a01400000 r--p 00000000 00:00 0 
6a01400000-6a01470000 rw-s 00000000 00:17 224035                         /run/dpdk/rte/fbarray_memseg-2048k-2-2
6a01600000-6e01600000 r--p 00000000 00:00 0 
6e01600000-6e01670000 rw-s 00000000 00:17 224036                         /run/dpdk/rte/fbarray_memseg-2048k-2-3
6e01800000-7201800000 r--p 00000000 00:00 0 
7201800000-7201870000 rw-s 00000000 00:17 224037                         /run/dpdk/rte/fbarray_memseg-2048k-3-0
7201a00000-7601a00000 r--p 00000000 00:00 0 
7601a00000-7601a70000 rw-s 00000000 00:17 224038                         /run/dpdk/rte/fbarray_memseg-2048k-3-1
7601c00000-7a01c00000 r--p 00000000 00:00 0 
7a01c00000-7a01c70000 rw-s 00000000 00:17 224039                         /run/dpdk/rte/fbarray_memseg-2048k-3-2
7a01e00000-7e01e00000 r--p 00000000 00:00 0 
7e01e00000-7e01e70000 rw-s 00000000 00:17 224040                         /run/dpdk/rte/fbarray_memseg-2048k-3-3
7e02000000-8202000000 r--p 00000000 00:00 0 
8202000000-8202020000 rw-s 80007b00000 00:0d 8356                        anon_inode:[vfio-device]
8202030000-8202130000 rw-s 80000200000 00:0d 8356                        anon_inode:[vfio-device]
ffff80000000-ffff80030000 rw-p 00000000 00:00 0 
ffff80030000-ffff84000000 ---p 00000000 00:00 0 
ffff84000000-ffff84030000 rw-p 00000000 00:00 0 
ffff84030000-ffff88000000 ---p 00000000 00:00 0 
ffff88000000-ffff88030000 rw-p 00000000 00:00 0 
ffff88030000-ffff8c000000 ---p 00000000 00:00 0 
ffff8c000000-ffff8c030000 rw-p 00000000 00:00 0 
ffff8c030000-ffff90000000 ---p 00000000 00:00 0 
ffff90000000-ffff90030000 rw-p 00000000 00:00 0 
ffff90030000-ffff94000000 ---p 00000000 00:00 0 
ffff94000000-ffff94030000 rw-p 00000000 00:00 0 
ffff94030000-ffff98000000 ---p 00000000 00:00 0 
ffff98000000-ffff98030000 rw-p 00000000 00:00 0 
ffff98030000-ffff9c000000 ---p 00000000 00:00 0 
ffff9cfb0000-ffff9cfc0000 ---p 00000000 00:00 0 
ffff9cfc0000-ffff9d7c0000 rw-p 00000000 00:00 0 
ffff9d7c0000-ffff9d7d0000 ---p 00000000 00:00 0 
ffff9d7d0000-ffff9dfd0000 rw-p 00000000 00:00 0 
ffff9dfd0000-ffff9dfe0000 ---p 00000000 00:00 0 
ffff9dfe0000-ffff9e7e0000 rw-p 00000000 00:00 0 
ffff9e7e0000-ffff9e7f0000 ---p 00000000 00:00 0 
ffff9e7f0000-ffff9eff0000 rw-p 00000000 00:00 0 
ffff9eff0000-ffff9f000000 ---p 00000000 00:00 0 
ffff9f000000-ffff9f800000 rw-p 00000000 00:00 0 
ffff9f800000-ffff9f810000 ---p 00000000 00:00 0 
ffff9f810000-ffffa0010000 rw-p 00000000 00:00 0 
ffffa0010000-ffffa0020000 ---p 00000000 00:00 0 
ffffa0020000-ffffa0820000 rw-p 00000000 00:00 0 
ffffa0820000-ffffa0830000 ---p 00000000 00:00 0 
ffffa0830000-ffffa1040000 rw-p 00000000 00:00 0 
ffffa1040000-ffffa1050000 ---p 00000000 00:00 0 
ffffa1050000-ffffa1850000 rw-p 00000000 00:00 0 
ffffa1850000-ffffa1860000 ---p 00000000 00:00 0 
ffffa1860000-ffffa2060000 rw-p 00000000 00:00 0 
ffffa2060000-ffffa2080000 r-xp 00000000 08:03 229                        /usr/lib64/libgcc_s-4.8.5-20150702.so.1
ffffa2080000-ffffa2090000 r--p 00010000 08:03 229                        /usr/lib64/libgcc_s-4.8.5-20150702.so.1
ffffa2090000-ffffa20a0000 rw-p 00020000 08:03 229                        /usr/lib64/libgcc_s-4.8.5-20150702.so.1
ffffa20a0000-ffffa2210000 r-xp 00000000 08:03 247                        /usr/lib64/libc-2.17.so
ffffa2210000-ffffa2220000 r--p 00160000 08:03 247                        /usr/lib64/libc-2.17.so
ffffa2220000-ffffa2230000 rw-p 00170000 08:03 247                        /usr/lib64/libc-2.17.so
ffffa2230000-ffffa2250000 r-xp 00000000 08:03 51073                      /usr/lib64/libpthread-2.17.so
ffffa2250000-ffffa2260000 r--p 00010000 08:03 51073                      /usr/lib64/libpthread-2.17.so
ffffa2260000-ffffa2270000 rw-p 00020000 08:03 51073                      /usr/lib64/libpthread-2.17.so
ffffa2270000-ffffa2280000 r-xp 00000000 08:03 253                        /usr/lib64/libdl-2.17.so
ffffa2280000-ffffa2290000 r--p 00000000 08:03 253                        /usr/lib64/libdl-2.17.so
ffffa2290000-ffffa22a0000 rw-p 00010000 08:03 253                        /usr/lib64/libdl-2.17.so
ffffa22a0000-ffffa22b0000 r-xp 00000000 08:03 230                        /usr/lib64/libnuma.so.1.0.0
ffffa22b0000-ffffa22c0000 r--p 00000000 08:03 230                        /usr/lib64/libnuma.so.1.0.0
ffffa22c0000-ffffa22d0000 rw-p 00010000 08:03 230                        /usr/lib64/libnuma.so.1.0.0
ffffa22d0000-ffffa2370000 r-xp 00000000 08:03 255                        /usr/lib64/libm-2.17.so
ffffa2370000-ffffa2380000 r--p 00090000 08:03 255                        /usr/lib64/libm-2.17.so
ffffa2380000-ffffa2390000 rw-p 000a0000 08:03 255                        /usr/lib64/libm-2.17.so
ffffa2390000-ffffa23a0000 r-xp 00000000 08:03 51079                      /usr/lib64/librt-2.17.so
ffffa23a0000-ffffa23b0000 r--p 00000000 08:03 51079                      /usr/lib64/librt-2.17.so
ffffa23b0000-ffffa23c0000 rw-p 00010000 08:03 51079                      /usr/lib64/librt-2.17.so
ffffa23c0000-ffffa23d0000 rw-p 00000000 00:00 0 
ffffa23d0000-ffffa23e0000 r--p 00000000 00:00 0                          [vvar]
ffffa23e0000-ffffa23f0000 r-xp 00000000 00:00 0                          [vdso]
ffffa23f0000-ffffa2410000 r-xp 00000000 08:03 240                        /usr/lib64/ld-2.17.so
ffffa2410000-ffffa2420000 r--p 00010000 08:03 240                        /usr/lib64/ld-2.17.so
ffffa2420000-ffffa2430000 rw-p 00020000 08:03 240                        /usr/lib64/ld-2.17.so
ffffdbe20000-ffffdbe50000 rw-p 00000000 00:00 0                          [stack]
[root@localhost simple_mp]#

https://www.cnblogs.com/MerlinJ/p/4074391.html

struct hugepage_info {
　　size_t hugepage_sz; /**< size of a huge page */
　　const char *hugedir; /**< dir where hugetlbfs is mounted */
　　uint32_t num_pages[RTE_MAX_NUMA_NODES];
　　/**< number of hugepages of that size on each socket */
　　int lock_descriptor; /**< file descriptor for hugepage dir */
};

具体赋值如下，

　　hpi->hugepage_sz = 2M;

　　hpi->hugedir = /mnt/huge;

　　hpi->num_pages[0] = 64; // 由于此时还不知道哪些内存页分处在哪个socket上，故，都先放在socket-0上。

　　hpi->lock_descriptor = open(hpi->hugedir, O_RONLY); // 在读取hugetlbfs配置的时候，需要锁住整个目录。当所有hugepage都mmap完成后，会解锁。

[root@localhost ~]# mount | grep huge
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,hugetlb)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel,pagesize=512M)
none on /mnt/huge type hugetlbfs (rw,relatime,seclabel,pagesize=2M)
[root@localhost ~]# ls /mnt/huge/
rtemap_65536  rtemap_65537  rtemap_65538  rtemap_65539  rtemap_65540  rtemap_65541
[root@localhost ~]#

rte_eal_config_create()主要是初始化rte_config.mem_config。如果是以root用户运行dpdk程序的话，rte_config.mem_config指向/var/run/.rte_config文件mmap的一段sizeof(struct rte_mem_config)大小的内存。

rte_config.mem_config =/var/run/dpdk/rte/config

如果是primary，则调用rte_eal_config_create(); 函数去创建/var/run/dpdk/rte/config 文件；并设置共享内存；

如果是secondary,则调用rte_eal_config_attach();去打开/var/run/dpdk/rte/config 文件，并设置相应的共享内存

文件mmap的首地址；

[root@localhost ~]# ls /var/run/dpdk/rte/config 
/var/run/dpdk/rte/config

rte_eal_hugepage_init()主要是在/mnt/huge目录下创建hugetlbfs配置的内存页数（在本文中就是64）的rtemap_xx文件，并为每个rtemap_xx文件做mmap映射，保证mmap后的虚拟地址与实际的物理地址是一样的。

[root@localhost ~]# ls /mnt/huge/
rtemap_65536  rtemap_65537  rtemap_65538  rtemap_65539  rtemap_65540  rtemap_65541

通过读取/proc/self/pagemap页表文件，得到本进程中虚拟地址与物理地址的映射关系。使用上一步中，每个rtemap_xx文件mmap得到的虚拟地址，除以操作系统内存页的大小4k，得到一个偏移量。根据这个偏移量，在/prox/self/pagemap中，得到物理地址的页框，假设为page，那么，物理页框page乘以操作系统内存页的大小4K，再加上虚拟地址的页偏移，就是物理地址。每个rtemap_xx映射的物理地址保存在对应的hugepage_file->physaddr中。

1 physaddr = ((page & 0x7fffffffffffffULL) * page_size) + ((unsigned long)virtaddr % page_size);

读取/proc/self/numa_maps，得到每个rtemap_xx文件mmap得到的虚拟地址在哪个Socket上，即，哪个CPU上。其socketid保存在对应的hugepage_file->socket_id中。

[root@localhost ~]# cat   /proc/79260/numa_maps 
00400000 default file=/data1/dpdk-19.11/examples/kni/build/app/kni mapped=48 N1=48 kernelpagesize_kB=64
00ad0000 default file=/data1/dpdk-19.11/examples/kni/build/app/kni anon=1 dirty=1 mapped=2 N0=1 N1=1 kernelpagesize_kB=64
00af0000 default file=/data1/dpdk-19.11/examples/kni/build/app/kni anon=4 dirty=4 N0=4 kernelpagesize_kB=64
00b30000 default anon=21 dirty=21 N0=21 kernelpagesize_kB=64
318d0000 default heap anon=43 dirty=43 N0=43 kernelpagesize_kB=64
100000000 default file=/run/dpdk/rte/config dirty=1 N0=1 kernelpagesize_kB=64
100010000 default file=/run/dpdk/rte/fbarray_memzone dirty=3 N0=3 kernelpagesize_kB=64
100040000 default file=/run/dpdk/rte/fbarray_memseg-524288k-0-0 dirty=1 N0=1 kernelpagesize_kB=64
120000000 default file=/dev/hugepages/rtemap_0 huge dirty=1 N0=1 kernelpagesize_kB=524288
140000000 default
920000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-0-1 dirty=1 N0=1 kernelpagesize_kB=64
940000000 default
1140000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-1-0 dirty=1 N0=1 kernelpagesize_kB=64
1160000000 default
1960000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-1-1 dirty=1 N0=1 kernelpagesize_kB=64
1980000000 default
2180000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-2-0 dirty=1 N0=1 kernelpagesize_kB=64
21a0000000 default
29a0000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-2-1 dirty=1 N0=1 kernelpagesize_kB=64
29c0000000 default
31c0000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-3-0 dirty=1 N0=1 kernelpagesize_kB=64
31e0000000 default
39e0000000 default file=/run/dpdk/rte/fbarray_memseg-524288k-3-1 dirty=1 N0=1 kernelpagesize_kB=64
3a00000000 default
4200000000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-0 dirty=7 N0=7 kernelpagesize_kB=64
4200200000 default file=/mnt/huge/rtemap_65536 huge dirty=1 N0=1 kernelpagesize_kB=2048
4200400000 default file=/mnt/huge/rtemap_65537 huge dirty=1 N0=1 kernelpagesize_kB=2048
4200600000 default file=/mnt/huge/rtemap_65538 huge dirty=1 N0=1 kernelpagesize_kB=2048
4200800000 default file=/mnt/huge/rtemap_65539 huge dirty=1 N0=1 kernelpagesize_kB=2048
4200a00000 default file=/mnt/huge/rtemap_65540 huge dirty=1 N0=1 kernelpagesize_kB=2048
4200c00000 default file=/mnt/huge/rtemap_65541 huge dirty=1 N0=1 kernelpagesize_kB=2048
4200e00000 default
4600200000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-1 dirty=7 N0=7 kernelpagesize_kB=64
4600400000 default
4a00400000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-2 dirty=7 N0=7 kernelpagesize_kB=64
4a00600000 default
4e00600000 default file=/run/dpdk/rte/fbarray_memseg-2048k-0-3 dirty=7 N0=7 kernelpagesize_kB=64
4e00800000 default
5200800000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-0 dirty=7 N0=7 kernelpagesize_kB=64
5200a00000 default
5600a00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-1 dirty=7 N0=7 kernelpagesize_kB=64
5600c00000 default
5a00c00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-2 dirty=7 N0=7 kernelpagesize_kB=64
5a00e00000 default
5e00e00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-1-3 dirty=7 N0=7 kernelpagesize_kB=64
5e01000000 default
6201000000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-0 dirty=7 N0=7 kernelpagesize_kB=64
6201200000 default
6601200000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-1 dirty=7 N0=7 kernelpagesize_kB=64
6601400000 default
6a01400000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-2 dirty=7 N0=7 kernelpagesize_kB=64
6a01600000 default
6e01600000 default file=/run/dpdk/rte/fbarray_memseg-2048k-2-3 dirty=7 N0=7 kernelpagesize_kB=64
6e01800000 default
7201800000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-0 dirty=7 N0=7 kernelpagesize_kB=64
7201a00000 default
7601a00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-1 dirty=7 N0=7 kernelpagesize_kB=64
7601c00000 default
7a01c00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-2 dirty=7 N0=7 kernelpagesize_kB=64
7a01e00000 default
7e01e00000 default file=/run/dpdk/rte/fbarray_memseg-2048k-3-3 dirty=7 N0=7 kernelpagesize_kB=64
7e02000000 default
8202000000 default file=anon_inode:[vfio-device]
8202030000 default file=anon_inode:[vfio-device]
ffff94000000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffff94030000 default
ffff98000000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffff98030000 default
ffff9c000000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffff9c030000 default
ffffa3130000 default
ffffa3140000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa3940000 default
ffffa3950000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa4150000 default
ffffa4160000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa4960000 default
ffffa4970000 default anon=2 dirty=2 N0=2 kernelpagesize_kB=64
ffffa5180000 default
ffffa5190000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa5990000 default
ffffa59a0000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa61a0000 default file=/usr/lib64/libgcc_s-4.8.5-20150702.so.1 mapped=1 mapmax=20 N2=1 kernelpagesize_kB=64
ffffa61c0000 default file=/usr/lib64/libgcc_s-4.8.5-20150702.so.1 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa61d0000 default file=/usr/lib64/libgcc_s-4.8.5-20150702.so.1 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa61e0000 default file=/usr/lib64/libc-2.17.so mapped=19 mapmax=27 N2=19 kernelpagesize_kB=64
ffffa6350000 default file=/usr/lib64/libc-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6360000 default file=/usr/lib64/libc-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6370000 default file=/usr/lib64/libpthread-2.17.so mapped=2 mapmax=21 N2=2 kernelpagesize_kB=64
ffffa6390000 default file=/usr/lib64/libpthread-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa63a0000 default file=/usr/lib64/libpthread-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa63b0000 default file=/usr/lib64/libdl-2.17.so mapped=1 mapmax=23 N2=1 kernelpagesize_kB=64
ffffa63c0000 default file=/usr/lib64/libdl-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa63d0000 default file=/usr/lib64/libdl-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa63e0000 default file=/usr/lib64/libnuma.so.1.0.0 mapped=1 mapmax=2 N0=1 kernelpagesize_kB=64
ffffa63f0000 default file=/usr/lib64/libnuma.so.1.0.0 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6400000 default file=/usr/lib64/libnuma.so.1.0.0 anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6410000 default file=/usr/lib64/libm-2.17.so mapped=1 mapmax=17 N0=1 kernelpagesize_kB=64
ffffa64b0000 default file=/usr/lib64/libm-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa64c0000 default file=/usr/lib64/libm-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa64d0000 default file=/usr/lib64/librt-2.17.so mapped=1 mapmax=20 N2=1 kernelpagesize_kB=64
ffffa64e0000 default file=/usr/lib64/librt-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa64f0000 default file=/usr/lib64/librt-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6500000 default anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6510000 default
ffffa6520000 default
ffffa6530000 default file=/usr/lib64/ld-2.17.so mapped=2 mapmax=27 N2=2 kernelpagesize_kB=64
ffffa6550000 default file=/usr/lib64/ld-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffa6560000 default file=/usr/lib64/ld-2.17.so anon=1 dirty=1 N0=1 kernelpagesize_kB=64
ffffdf9f0000 default stack anon=1 dirty=1 N0=1 kernelpagesize_kB=64
[root@localhost ~]#

[root@localhost ~]# getconf PAGESIZE
65536  --64K=64*1024
[root@localhost ~]#

次进程使用

次进程主要是把重新组织的内存映射到进程中。

根据共享的mem_config，获得memseg段信息。memseg中包括每个段的信息（段大小、虚拟和物理地址等）。再检查是否能获得每个段对应的虚拟地址空间。
然后，再根据共享的.rte_hugepage_info获得每个页信息。
根据.rte_hugepage_info中每个页的信息(dir、memseg_id)，把每个页映射到次进程中，映射的虚拟地址和主进程中的一样。

helloworld

CFLAGS += -O3  -I$(RTE_SDK)/lib/librte_eal/common/
CFLAGS += $(WERROR_FLAGS)

include $(RTE_SDK)/mk/rte.extapp.mk

endif

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>

#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_debug.h>
#include <unistd.h>
#include "eal_private.h"
static int
lcore_hello(__attribute__((unused)) void *arg)
{
        unsigned lcore_id,  socket_id;
        lcore_id = rte_lcore_id();
        socket_id = rte_socket_id();
        printf("hello from core %u
", lcore_id);
        printf("socket id  %u
", socket_id);
        sleep(60); 
        return 0;
}

int
main(int argc, char **argv)
{
        int ret;
        unsigned lcore_id;

        ret = rte_eal_init(argc, argv);
        if (ret < 0)
                rte_panic("Cannot init EAL
");

        /* call lcore_hello() on every slave lcore */
        RTE_LCORE_FOREACH_SLAVE(lcore_id) {
                rte_eal_remote_launch(lcore_hello, NULL, lcore_id);
        }

        /* call it on master lcore too */
        lcore_hello(NULL);
        struct rte_config *tmp_config;
        tmp_config=rte_eal_get_configuration();
        printf("rte_config->lcore_count = %d 
",tmp_config->lcore_count);
        rte_eal_mp_wait_lcore();
        return 0;
}

[root@localhost helloworld]# build/app/helloworld -c 0xf -n 4 --proc-type=auto
EAL: Detected 128 lcore(s)
EAL: Detected 4 NUMA nodes
EAL: Auto-detected process type: PRIMARY
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:05:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:200 net_hinic
EAL:   using IOMMU type 1 (Type 1)
net_hinic: Initializing pf hinic-0000:05:00.0 in primary process
net_hinic: Device 0000:05:00.0 hwif attribute:
net_hinic: func_idx:0, p2p_idx:0, pciintf_idx:0, vf_in_pf:0, ppf_idx:0, global_vf_id:15, func_type:2
net_hinic: num_aeqs:4, num_ceqs:4, num_irqs:32, dma_attr:2
net_hinic: Get public resource capability:
net_hinic: host_id: 0x0, ep_id: 0x0, intr_type: 0x0, max_cos_id: 0x7, er_id: 0x0, port_id: 0x0
net_hinic: host_total_function: 0xf2, host_oq_id_mask_val: 0x8, max_vf: 0x78
net_hinic: pf_num: 0x2, pf_id_start: 0x0, vf_num: 0xf0, vf_id_start: 0x10
net_hinic: Get share resource capability:
net_hinic: host_pctxs: 0x0, host_cctxs: 0x0, host_scqs: 0x0, host_srqs: 0x0, host_mpts: 0x0
net_hinic: Get l2nic resource capability:
net_hinic: max_sqs: 0x10, max_rqs: 0x10, vf_max_sqs: 0x4, vf_max_rqs: 0x4
net_hinic: Initialize 0000:05:00.0 in primary successfully
EAL: PCI device 0000:06:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:200 net_hinic
EAL: PCI device 0000:7d:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:a222 net_hns3
EAL: PCI device 0000:7d:00.1 on NUMA socket 0
EAL:   probe driver: 19e5:a221 net_hns3
EAL: PCI device 0000:7d:00.2 on NUMA socket 0
EAL:   probe driver: 19e5:a222 net_hns3
EAL: PCI device 0000:7d:00.3 on NUMA socket 0
EAL:   probe driver: 19e5:a221 net_hns3
hello from core 1
socket id  0
hello from core 2
socket id  0
hello from core 3
socket id  0
hello from core 0
socket id  0

rte_config->lcore_count = 4 
[root@localhost helloworld]#

#define FBARRAY_NAME_FMT "%s/fbarray_%s"
static inline const char *
eal_get_fbarray_path(char *buffer, size_t buflen, const char *name) {
        snprintf(buffer, buflen, FBARRAY_NAME_FMT, rte_eal_get_runtime_dir(),
                        name);
        return buffer;
}

/** String format for hugepage map files. */
#define HUGEFILE_FMT "%s/%smap_%d"
static inline const char *
eal_get_hugefile_path(char *buffer, size_t buflen, const char *hugedir, int f_id)
{
        snprintf(buffer, buflen, HUGEFILE_FMT, hugedir,
                        eal_get_hugefile_prefix(), f_id);
        return buffer;
}

rte_fbarray_init

struct rte_fbarray {
        char name[RTE_FBARRAY_NAME_LEN]; /**< name associated with an array */
        unsigned int count;              /**< number of entries stored */
        unsigned int len;                /**< current length of the array */
        unsigned int elt_sz;             /**< size of each element */
        void *data;                      /**< data pointer */
        rte_rwlock_t rwlock;             /**< multiprocess lock */
};

rte_fbarray_init：                   ----------------------------主进程
    data = eal_get_virtual_area(NULL, &mmap_len, page_sz, 0, 0);

rte_fbarray_attach(struct rte_fbarray *arr)    -------------次进程
    data = eal_get_virtual_area(arr->data, &mmap_len, page_sz, 0, 0);

rte_fbarray_init 
     data = eal_get_virtual_area(NULL, &mmap_len, page_sz, 0, 0);
     eal_get_fbarray_path(path, sizeof(path), name); //生成/run/dpdk/rte/fbarray_memseg文件
     resize_and_map   //调用mmap

resize_and_map(int fd, void *addr, size_t len)
{
        char path[PATH_MAX];
        void *map_addr;

        if (ftruncate(fd, len)) {
                RTE_LOG(ERR, EAL, "Cannot truncate %s
", path);
                /* pass errno up the chain */
                rte_errno = errno;
                return -1;
        }

        map_addr = mmap(addr, len, PROT_READ | PROT_WRITE,
                        MAP_SHARED | MAP_FIXED, fd, 0);
        if (map_addr != addr) {
                RTE_LOG(ERR, EAL, "mmap() failed: %s
", strerror(errno));
                /* pass errno up the chain */
                rte_errno = errno;
                return -1;
        }
        return 0;
}

struct rte_config {
        uint32_t master_lcore;       /**< Id of the master lcore */
        uint32_t lcore_count;        /**< Number of available logical cores. */
        uint32_t numa_node_count;    /**< Number of detected NUMA nodes. */
        uint32_t numa_nodes[RTE_MAX_NUMA_NODES]; /**< List of detected NUMA nodes. */
        uint32_t service_lcore_count;/**< Number of available service cores. */
        enum rte_lcore_role_t lcore_role[RTE_MAX_LCORE]; /**< State of cores. */

        /** Primary or secondary configuration */
        enum rte_proc_type_t process_type;

        /** PA or VA mapping mode */
        enum rte_iova_mode iova_mode;

        /**
         * Pointer to memory configuration, which may be shared across multiple
         * DPDK instances
         */
        struct rte_mem_config *mem_config;
} __attribute__((__packed__));
struct rte_mem_config {
        volatile uint32_t magic;   /**< Magic number - sanity check. */
        uint32_t version;
        /**< Prevent secondary processes using different DPDK versions. */

        /* memory topology */
        uint32_t nchannel;    /**< Number of channels (0 if unknown). */
        uint32_t nrank;       /**< Number of ranks (0 if unknown). */

        /**
         * current lock nest order
         *  - qlock->mlock (ring/hash/lpm)
         *  - mplock->qlock->mlock (mempool)
         * Notice:
         *  *ALWAYS* obtain qlock first if having to obtain both qlock and mlock
         */
        rte_rwlock_t mlock;   /**< used by memzones for thread safety. */
        rte_rwlock_t qlock;   /**< used by tailqs for thread safety. */
        rte_rwlock_t mplock;  /**< used by mempool library for thread safety. */
        rte_spinlock_t tlock; /**< used by timer library for thread safety. */

        rte_rwlock_t memory_hotplug_lock;
        /**< Indicates whether memory hotplug request is in progress. */

        /* memory segments and zones */
        struct rte_fbarray memzones; /**< Memzone descriptors. */

        struct rte_memseg_list memsegs[RTE_MAX_MEMSEG_LISTS];
        /**< List of dynamic arrays holding memsegs */
              struct rte_tailq_head tailq_head[RTE_MAX_TAILQ];
        /**< Tailqs for objects */

        struct malloc_heap malloc_heaps[RTE_MAX_HEAPS];
        /**< DPDK malloc heaps */

        int next_socket_id; /**< Next socket ID for external malloc heap */

        /* rte_mem_config has to be mapped at the exact same address in all
         * processes, so we need to store it.
         */
        uint64_t mem_cfg_addr; /**< Address of this structure in memory. */

        /* Primary and secondary processes cannot run with different legacy or
         * single file segments options, so to avoid having to specify these
         * options to all processes, store them in shared config and update the
         * internal config at init time.
         */
        uint32_t legacy_mem; /**< stored legacy mem parameter. */
        uint32_t single_file_segments;
        /**< stored single file segments parameter. */

        uint64_t tsc_hz;
        /**< TSC rate */

        uint8_t dma_maskbits; /**< Keeps the more restricted dma mask. */
};

DPDK内存的初始化

内存的初始化在rte_eal_init()中完成，由于DPDK的进程分为primary和secondary，内存的初始化工作只能在primory进程中完成。主要的步骤如下：

eal_hugepage_info_init()；获取大页的信息，并初始化内部的结构。
rte_config_init();创建配置文件,并做内存映射。
rte_eal_memory_init()；大页的内存初始化，并连接成连续的内存区。
rte_eal_memzone_init()；初始化memzone子系统。

              
eal_get_virtual_area
    mapped_addr = mmap(requested_addr, (size_t)map_sz, PROT_READ,
                                mmap_flags, -1, 0);  ---匿名映射,通过mmap申请堆内存

mmap匿名映射

从原型可知，存在一个参数为fd，根据fd，存在一种情况叫匿名映射，所谓匿名映射，表示不存在fd这么个真实的文件。实现匿名映射的方式主要有以下两种：
1、BSD 提供匿名映射的办法是fd =-1，同时 flag 指定为MAP_SHARE|MAP_ANON。
ptr = mmap（NULL，sizeof（int），PROT_READ|PROT_WRITE，
MAP_SHARED|MAP_ANON，-1,0）；

2、SVR4 提供匿名映射的办法是 open /dev/zero设备文件，把返回的文件描述符，作为mmap的fd参数。
fd = open（"/dev/zero",O_RDWR）;
/dev/zero 是一个特殊的文件，当你读它的时候，它会提供无限的空字符(NULL, ASCII NUL, 0x00)
一个作用是用它作为源，产生一个特定大小的空白文件。

查看全文

相关阅读:
【NLP CS224N笔记】汇总
 【NLP CS224N笔记】Lecture 2
论文摘记 2017.5
FAST UA API
FAST Hello World
NetMagic Simple Overview
论文摘记 2017.4.25-4.30
LLDP协议、STP协议笔记
 FAST：通过Floodlight控制器下发流表
 FAST：NetMagic交换机与 Floodlight控制器连接实战

原文地址：https://www.cnblogs.com/dream397/p/13578759.html