Linux Certif

Toute la documentation sur la certification Linux LPI

slabinfo

̾Á°

/proc/slabinfo - ¥«¡¼¥Í¥ë slab ¥¢¥í¥±¡¼¥¿¤ÎÅý·×

½ñ¼°

cat /proc/slabinfo

ÀâÌÀ

Linux ¥«¡¼¥Í¥ë¤ÎÆâÉô¤ÇÎɤ¯ÍøÍѤµ¤ì¤ë¥ª¥Ö¥¸¥§¥¯¥È (¥Ð¥Ã¥Õ¥¡¥Ø¥Ã¥É¡¢i-¥Î¡¼¥É¡¢¥Ç¥£¥ì¥¯¥È¥ê¡¦¥¨¥ó¥È¥ê¤Ê¤É) ¤Ï¡¢¤½¤ì¤¾¤ì¼«Ê¬ÍѤΥ­¥ã¥Ã¥·¥å¤òÈ÷¤¨¤Æ¤¤¤ë¡£¥Õ¥¡¥¤¥ë /proc/slabinfo ¤Ï¤³¤ì¤é¤ÎÅý·×¤òÍ¿¤¨¤ë¡£Îã¤ò¼¨¤¹¡£

% cat /proc/slabinfo

slabinfo - version: 1.1

kmem_cache            60     78    100    2    2    1

blkdev_requests     5120   5120     96  128  128    1

mnt_cache             20     40     96    1    1    1

inode_cache         7005  14792    480 1598 1849    1

dentry_cache        5469   5880    128  183  196    1

filp                 726    760     96   19   19    1

buffer_head        67131  71240     96 1776 1781    1

vm_area_struct      1204   1652     64   23   28    1

...

size-8192              1     17   8192    1   17    2

size-4096             41     73   4096   41   73    1

...

¤½¤ì¤¾¤ì¤Î slab ¥­¥ã¥Ã¥·¥å¤´¤È¤Ë¡¢¥­¥ã¥Ã¥·¥å¤Î̾Á°¡¢ ¸½ºß¥¢¥¯¥Æ¥£¥Ö¤Ê¥ª¥Ö¥¸¥§¥¯¥È¤Î¿ô¡¢ÍøÍѲÄǽ¤Ê¥ª¥Ö¥¸¥§¥¯¥È¤ÎÁí¿ô¡¢ ³Æ¥ª¥Ö¥¸¥§¥¯¥È¤Î¥µ¥¤¥º (¥Ð¥¤¥Èñ°Ì)¡¢¾¯¤Ê¤¯¤È¤â°ì¤Ä¤Î¥¢¥¯¥Æ¥£¥Ö¤Ê ¥ª¥Ö¥¸¥§¥¯¥È¤òÍ­¤¹¤ë¥Ú¡¼¥¸¤Î¿ô¡¢¥¢¥í¥±¡¼¥È¤µ¤ì¤¿¥Ú¡¼¥¸¤ÎÁí¿ô¡¢ slab ¤¢¤¿¤ê¤Î¥Ú¡¼¥¸¿ô¡¢¤¬Í¿¤¨¤é¤ì¤Æ¤¤¤ë¡£

¤Ê¤ª¡¢ ¥ª¥Ö¥¸¥§¥¯¥È¤Î¥¢¥é¥¤¥ó¥á¥ó¥È¤È slab ¥­¥ã¥Ã¥·¥å¤Î¥ª¡¼¥Ð¡¼¥Ø¥Ã¥É¤È¤Ë¤è¤ê¡¢ ¥ª¥Ö¥¸¥§¥¯¥È¤ÏÄ̾ï¥Ú¡¼¥¸¤ÎÆâÉô¤Ë¤­¤Ã¤Á¤ê¤È¤Ï¼ý¤á¤é¤ì¤Æ¤¤¤Ê¤¤¡£ ÍøÍÑÃæ¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ò¤Ò¤È¤Ä¤Ç¤âÊÝ»ý¤·¤Æ¤¤¤ë¥Ú¡¼¥¸¤Ï¡¢ ÍøÍÑÃæ¤Ç¤¢¤ë¤È¤ß¤Ê¤µ¤ì¡¢²òÊü¤Ç¤­¤Ê¤¤¡£

slab ¥­¥ã¥Ã¥·¥åÅý·×¤Îµ¡Ç½¤òÍ­¸ú¤Ë¤·¤Æ¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¥«¡¼¥Í¥ë¤Ç¤Ï¡¢ ½ÐÎϤκǽé¤Î¹Ô¤Ë "(statistics)" ¤Èɽ¼¨¤µ¤ì¡¢ 5 ¤Ä¤Î¥«¥é¥à¤¬Äɲ䵤ì¤ë¡£ ¤½¤ì¤¾¤ì¡¢¥¢¥¯¥Æ¥£¥Ö¤Ê¥ª¥Ö¥¸¥§¥¯¥È¤Î½Ö´ÖºÇÂçÃÍ¡¢ ¥ª¥Ö¥¸¥§¥¯¥È¤¬¥¢¥í¥±¡¼¥È¤µ¤ì¤¿²ó¿ô¡¢ ¥­¥ã¥Ã¥·¥å¤ÎÂ礭¤µ¤¬³ÈÄ¥¤µ¤ì¤¿ (¿·¤·¤¤¥Ú¡¼¥¸¤¬¤³¤Î¥­¥ã¥Ã¥·¥å¤ËÄɲ䵤줿) ²ó¿ô¡¢ ¥­¥ã¥Ã¥·¥å¤ÎÂ礭¤µ¤¬½Ì¾®¤µ¤ì¤¿ (»È¤Ã¤Æ¤¤¤Ê¤¤¥Ú¡¼¥¸¤¬¤³¤Î¥­¥ã¥Ã¥·¥å¤«¤éºï½ü¤µ¤ì¤¿) ²ó¿ô¡¢ ¿·¤¿¤Ê¥Ú¡¼¥¸¤ò¤³¤Î¥­¥ã¥Ã¥·¥å¤Ë¥¢¥í¥±¡¼¥È¤¹¤ëºÝ¤Ëµ¯¤­¤¿¥¨¥é¡¼¤Î²ó¿ô¡¢¤Ç¤¢¤ë¡£ slab ¥­¥ã¥Ã¥·¥åÅý·×¤¬»È¤¨¤Ê¤¤¥«¡¼¥Í¥ë¤Ç¤Ï¡¢¤³¤ì¤é¤Î¥«¥é¥à¤Ïɽ¼¨¤µ¤ì¤Ê¤¤¡£

SMP ¥·¥¹¥Æ¥à¤Ç¤Ï¡¢½ÐÎϤκǽé¤Î¹Ô¤Ë "(SMP)" ¤Èɽ¼¨¤µ¤ì¡¢ ³Æ slab ¤´¤È¤Ë 2 ¤Ä¤Î¥«¥é¥à¤¬Äɲ䵤ì¤ë¡£ ¤³¤ì¤é¤Ï³Æ CPU ¤¬»ý¤Ä¥í¡¼¥«¥ë¤Ê¥­¥ã¥Ã¥·¥å (per-CPU ¥­¥ã¥Ã¥·¥å) ¤Î slab ¥¢¥í¥±¡¼¥·¥ç¥ó¥Ý¥ê¥·¡¼¤òɽ¼¨¤¹¤ë (per-CPU ¥­¥ã¥Ã¥·¥å¤Ï¡¢ ¥ª¥Ö¥¸¥§¥¯¥È¤ò¥­¥ã¥Ã¥·¥å¤«¤é¥¢¥í¥±¡¼¥È¤¹¤ëºÝ¤Ë CPU ´Ö¤Ç¤ÎƱ´ü¤ò¸º¾¯¤µ¤»¤ë¤¿¤á¤ËÀߤ±¤é¤ì¤Æ¤¤¤ë)¡£ ºÇ½é¤Î¥«¥é¥à¤Ï per-CPU À©¸Â¡¢ ¤¹¤Ê¤ï¤Á³Æ CPU ¤´¤È¤Ë¥­¥ã¥Ã¥·¥å¤Ç¤­¤ë¥ª¥Ö¥¸¥§¥¯¥È¤ÎºÇÂç¿ô¤Ç¤¢¤ë¡£ ÆóÈÖÌܤΥ«¥é¥à¤Ï¥Ð¥Ã¥Á¥«¥¦¥ó¥È¡¢ ¤¹¤Ê¤ï¤Á per-CPU ¥­¥ã¥Ã¥·¥å¤¬¶õ¤À¤Ã¤¿¤ê°ìÇÕ¤À¤Ã¤¿¤ê¤·¤¿¾ì¹ç¤Ë¡¢ ¥°¥í¡¼¥Ð¥ë¤Ê¥­¥ã¥Ã¥·¥å¤È¼õ¤±ÅϤ·¤Ç¤­¤ë¥Õ¥ê¡¼¤Ê¥ª¥Ö¥¸¥§¥¯¥È¤ÎºÇÂç¿ô¤Ç¤¢¤ë¡£

slab ¥­¥ã¥Ã¥·¥åÅý·×¤È SMP ¤¬Î¾ÊýÍ­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤ë¾ì¹ç¤Ï¡¢ per-CPU ¥­¥ã¥Ã¥·¥å¤ÎÅý·×¤òɽ¼¨¤¹¤ë 4 ¤Ä¤Î¥«¥é¥à¤¬¤µ¤é¤ËÄɲ䵤ì¤ë¡£ ºÇ½é¤Î 2 ¤Ä¤Ï per-CPU ¥­¥ã¥Ã¥·¥å¤Î ¥¢¥í¥±¡¼¥·¥ç¥ó¥Ò¥Ã¥È¥«¥¦¥ó¥È¤È¥¢¥í¥±¡¼¥·¥ç¥ó¥ß¥¹¥«¥¦¥ó¥È¤Ç¤¢¤ë¡£ ¤¹¤Ê¤ï¤Á¡¢¤¢¤ë¥ª¥Ö¥¸¥§¥¯¥È¤ò¥¢¥í¥±¡¼¥È¤·¤¿¤È¤­¤Ë¡¢ ¤½¤ì¤¬ per-CPU ¥­¥ã¥Ã¥·¥å¤ÎÆâÉô¤Ë ¤¢¤Ã¤¿/¤Ê¤«¤Ã¤¿ ²ó¿ô¤Ç¤¢¤ë¡£ ³¤¯ 2 ¤Ä¤Ï¡¢per-CPU ¥­¥ã¥Ã¥·¥å¤Î¥Õ¥ê¡¼¥Ò¥Ã¥È¥«¥¦¥ó¥È¤È¥ß¥¹¥«¥¦¥ó¥È¤Ç¤¢¤ë¡£ ¤¹¤Ê¤ï¤Á²òÊü¤µ¤ì¤¿¥ª¥Ö¥¸¥§¥¯¥È¤ò¥°¥í¡¼¥Ð¥ë¤Ê¥­¥ã¥Ã¥·¥å¤Ë¥Õ¥é¥Ã¥·¥å¤¹¤ëÁ°¤Ë¡¢ per-CPU ¥­¥ã¥Ã¥·¥å¤ÎÀ©¸Â¤ÎÈÏ°Ï¤Ë ¼ý¤Þ¤Ã¤¿/¼ý¤Þ¤é¤Ê¤«¤Ã¤¿ ²ó¿ô¤Ç¤¢¤ë¡£

SMP ¤Ë¤ª¤¤¤Æ per-CPU slab ¥­¥ã¥Ã¥·¥å¤ÎÀ©¸ÂÃÍ¤ä ¥Ð¥Ã¥Á¥«¥¦¥ó¥È¤òÊѹ¹¤¹¤ë¤Ë¤Ï¡¢°Ê²¼¤Î¤è¤¦¤Ë¤¹¤ì¤Ð¤è¤¤:

echo "cache_name limit batchcount" > /proc/slabinfo

¥Õ¥¡¥¤¥ë

<linux/slab.h>

¥Ð¡¼¥¸¥ç¥ó

/proc/slabinfo ¤Ï Linux 2.1.23 °Ê¹ß¤Ë¸ºß¤¹¤ë¡£ SMP ¤Ë¤ª¤±¤ë CPU ¤´¤È¤Î¥­¥ã¥Ã¥·¥å¤Ï Linux 2.4.0-test3 °Ê¹ß¤Ë¸ºß¤¹¤ë¡£