LinuxÄÚ´æ¹ÜÀíÖ®slab·ÖÅäÆ÷·ÖÎö(ÐøËÄ)
Æß£ºkmem_cache_free£¨£©µÄʵÏÖ
kmem_cache_freeÓÃÓÚ°Ñ´ÓslabÖзÖÅäµÄ¶ÔÏóÊͷŵô£¬Í¬·ÖÅäÒ»Ñù£¬ËüÊ×ÏÈ»á°ÑËü·Åµ½ACÖУ¬Èç¹ûACÂúÁË£¬Ôò°Ñ¶ÔÏóÊͷŵ½shareÁ´ÖУ¬Èç¹ûshareÒ²ÂúÁË£¬Ò²¾Í°ÑËüÊÍ·ÅÖÁslab¡£À´¿´¾ßÌåµÄ´úÂ룺
void kmem_cache_free (kmem_cache_t *cachep, void *objp)
{
unsigned long flags;
local_irq_save(flags);
__cache_free(cachep, objp);
local_irq_restore(flags);
}
º¯Êýµ÷ÓÃ__cache_free(),´úÂëÈçÏ£º
static inline void __cache_free (kmem_cache_t *cachep, void* objp)
{
struct array_cache *ac = ac_data(cachep);
check_irq_off();
//DEBUGÓ㬺öÂÔ
objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
//Èç¹ûACÖеĶÔÏñûÓг¬¹ýÏÞÖÆ£¬ÄǾͰÑËüÊͷŵ½ACÖС£
if (likely(ac->avail < ac->limit)) {
STATS_INC_FREEHIT(cachep);
ac_entry(ac)[ac->avail++] = objp;
return;
} else {
//Èç¹ûACÖжÔÏóÊýÄ¿µ½ÁËÏÞÖµ£¬Ôòcache_flusharray£¨£©ºó£¬ÔٰѶÔÏñ¼ÓÈëACÖÐ
STATS_INC_FREEMISS(cachep);
cache_flusharray(cachep, ac);
ac_entry(ac)[ac->avail++] = objp;
}
}
Èç¹ûµ±Ç°ACÖжÔÏóÊýÒѾµ½´ïÏÞÖµ£¬¾Í»áµ÷ÓÃcache_flusharray()½«ÀïÃæµÄ¶ÔÏó“ˢД³öÈ¥¡£´úÂëÈçÏ£º
static void cache_flusharray (kmem_cache_t* cachep, struct array_cache *ac)
{
int batchcount;
Ïà¹ØÎĵµ£º
ÖÚËùÖÜÖª£¬LinuxµÄÎļþȨÏÞÈç:
777;666µÈ£¬ÆäʵֻҪÔÚÏàÓ¦µÄÎļþÉϼÓÉÏUIDµÄȨÏÞ£¬¾Í¿ÉÒÔÓõ½¼ÓȨÏÞÈ˵ÄÉí·ÝÈ¥ÔËÐÐÕâ¸öÎļþ¡£ËùÒÔÎÒÃÇÖ»ÐèÒª½«bash¸´ÖƳöÀ´µ½ÁíÒ»¸öµØ·½£¬
È»ºóÓÃroot¼ÓÉÏUIDȨÏÞ£¬Ö»ÒªÓû§ÔËÐдËShell¾Í¿ÉÒÔÓÃÓÃrootµÄÉí·ÝÀ´Ö´ÐÐÈκÎÎļþÁË¡£
£±.LinuxÏÂÈçºÎÖªµÀij¸ö¶Ë¿ÚÔÚÔËÐÐʲô³ÌÐò
µ±ÎÒÃÇÓ ......
ÔÚLinuxÏÂÓÃbuildroot´î½¨mips/armµÄ½»²æ±àÒëÆ½Ì¨
Õâ¸ö±àÒë»·¾³ÊDz»ÄܱàÒëfor¿ªÔ´ÎÞÏß·ÓÉÆ÷µÄ³ÌÐòµÄ£¬ÒòΪÄÚºËÊÇ2.6µÄ
½¨Òé²Î¿¼ÕâÆª: http://www.felix021.com/blog/read.php?1467
ǰÁ½ÌìÂòÁËNetGear WRT614 V9£¬´îÔØµÄÊÇBroadcomµÄ200MHz MIPS´¦ÀíÆ÷¡£
ÓÉÓÚʹÓõÄÊÇ¿ªÔ´²Ù×÷ϵͳLinux£¬ËùÒÔ¿ÉÒÔË¢ÍøÉÏһЩNBµÄ ......
תÀ´µÄ£¬Ã»Ê¿ÉÒÔ¿´¿´
bin = BINaries
/dev = DEVices
/etc = ETCetera
/lib = LIBrary
/proc = PROCesses
/sbin = Superuser BINaries
/tmp = TeMPorary
/usr = Unix Shared Resources
/var = VARiable ?
FIFO = First In, First Out
GRUB = GRand Unified Bootloader
IFS = Internal Field Seperators
LILO ......
inux±ØÑ§µÄ60¸öÃüÁî
LinuxÌṩÁË´óÁ¿µÄÃüÁÀûÓÃËü¿ÉÒÔÓÐЧµØÍê³É´óÁ¿µÄ¹¤×÷£¬Èç´ÅÅ̲Ù×÷¡¢Îļþ´æÈ¡¡¢Ä¿Â¼²Ù×÷¡¢½ø³Ì¹ÜÀí¡¢ÎļþȨÏÞÉ趨µÈ¡£ËùÒÔ£¬ÔÚLinuxϵͳÉϹ¤×÷Àë²»¿ªÊ¹ÓÃϵͳÌṩµÄÃüÁî¡£ÒªÏëÕæÕýÀí½âLinuxϵͳ£¬¾Í±ØÐë´ÓLinuxÃüÁîѧÆð£¬Í¨¹ý»ù´¡µÄÃüÁîѧϰ¿ÉÒÔ½øÒ»²½Àí½âLinuxϵͳ¡£
²»Í¬Linux·¢ÐаæµÄÃüÁîÊýÁ¿² ......