Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

LinuxÄÚ´æ¹ÜÀíÖ®slab·ÖÅäÆ÷·ÖÎö(ÐøÎå)

 ¾Å£º¼¸µã²¹³ä£º
1: SlabÖÐʹÓõÄÒ³Ãæ¶¼»á¼ÓÉÏ“PG_slab”±êÖ¾£¬ÒÔ¸úÒ»°ãµÄÒ³ÃæÇø±ð¡£ÁíÍ⣬ÔÚÊÍ·ÅÄÚ´æµÄʱºò£¬¾­³£ÐèÒªÓõ½´ÓÒ³Ãæµ½slabµÄ¶ÔӦת»»¹ØÏµ¡£ÄÇÊÇÔõÑù±êʶµÄÄØ£¿
¹ØÓÚ±êÖ¾£º
×¢ÒâÓÐÒÔÏ´úÂ룺
static void *kmem_getpages(kmem_cache_t *cachep, int flags, int nodeid)
{
     ……
     while (i--) {
         //Ϊ·ÖµÃµÄÿһ¸öÒ³ÃæÉèÖÃPG_slab±êÖ¾
         SetPageSlab(page);
         page++;
     }
……
}
¹ØÓÚ´ÓÒ³Ãæµ½slabµÄת»»£º
  Ïò»ï°éϵͳÇëÇóÄÚ´æ
static int cache_grow (kmem_cache_t * cachep, int flags)
{
     ……
     //ÇëÇóÄÚ´æ¹ýºó£¬ÉèÖÃÄÚ´æÊôÐÔ
set_slab_attr(cachep, slabp, objp);
……
}
static void set_slab_attr(kmem_cache_t *cachep, struct slab *slabp, void *objp)
{
     int i;
     struct page *page;
     //¼ÆËãÒ³Ãæ×ÜÊý
     i = 1 << cachep->gfporder;
     //ÐéÄâµØÖ·×ª»»³ÉÏàÓ¦Ò³Ãæ
     page = virt_to_page(objp);
     do {
         // #define    SET_PAGE_CACHE(pg,x)  ((pg)->lru.next = (struct list_head *)(x))
         SET_PAGE_CACHE(page, cachep);
         #define  SET_PAGE_SLAB(pg,x)   ((pg)->lru.prev = (struct list_head *)(x))
         SET_PAGE_SLAB(page, slabp);
         page++;
     } while (--i);
}
´ÓÉÏÃæµÄº¯


Ïà¹ØÎĵµ£º

ʵսLinux Bluetooth±à³Ì£¨Èý£© HCI²ã±à³Ì

1. HCI²ãЭÒé¸ÅÊö£º
HCIÌṩһÌ×ͳһµÄ·½·¨À´·ÃÎÊBluetoothµ×²ã¡£ÈçͼËùʾ£º
´ÓͼÉÏ¿ÉÒÔ¿´³ö£¬Host Controller Interface(HCI)  ¾ÍÊÇÓÃÀ´¹µÍ¨HostºÍModule¡£Hostͨ³£¾ÍÊÇPC£¬ ModuleÔòÊÇÒÔ¸÷ÖÖÎïÀíÁ¬½ÓÐÎʽ£¨USB,serial,pc-cardµÈ£©Á¬½Óµ½PCÉϵÄbluetooth Dongle¡£
ÔÚHostÕâÒ»¶Ë£ºapplication,SDP,L2capµÈЭÒé ......

ʵսLinux Bluetooth±à³Ì(Áù) L2CAP±à³ÌʵÀý

ÀýÒ»£º·¢ËÍSignaling Packet£º
Signaling CommandÊÇ2¸öBluetoothʵÌåÖ®¼äµÄL2CAP²ãÃüÁî´«Êä¡£ËùÒÔµÃSignaling CommandʹÓÃCID 0x0001.
¶à¸öCommand¿ÉÒÔÔÚÒ»¸öC-frame£¨control frame£©Öз¢ËÍ¡£
 Èç¹ûÒªÖ±½Ó·¢ËÍSignaling Command.ÐèÒª½¨Á¢SOCK_RAWÀàÐ͵ÄL2CAPÁ¬½ÓSocket¡£ÕâÑù²ÅÓлú»á×Ô¼ºÌî³äCommand Code£¬Identi ......

ʵսLinux Bluetooth±à³Ì (Æß) SDPЭÒé

Service Discovery Protocol(SDP)ÌṩһÖÖÄÜÁ¦£¬ÈÃÓ¦ÓóÌÐòÓз½·¨·¢ÏÖÄÄÖÖ·þÎñ¿ÉÓÃÒÔ¼°ÕâÖÖ·þÎñµÄÌØÐÔ¡£
·þÎñ·¢ÏÖЭÒé(SDP»òBluetooth SDP)ÔÚÀ¶ÑÀЭÒéÕ»ÖжÔÀ¶ÑÀ»·¾³ÖеÄÓ¦ÓóÌÐòÓÐÌØÊâµÄº¬Ò⣬·¢ÏÖÄĸö·þÎñÊÇ¿ÉÓõĺÍÈ·¶¨ÕâЩ¿ÉÓ÷þÎñµÄÌØÕ÷¡£SDP¶¨ÒåÁËbluetooth client·¢ÏÖ¿ÉÓÃbluetooth server·þÎñºÍËüÃǵÄÌØÕ÷µÄ·½·¨¡£ ......

Linux+Apache+Mysql+PHPµäÐÍÅäÖÃ


°æÈ¨ÉùÃ÷£º¿ÉÒÔÈÎÒâ×ªÔØ£¬×ªÔØÊ±ÇëÎñ±ØÒÔ³¬Á´½ÓÐÎʽ±êÃ÷ÎÄÕÂԭʼ³ö´¦ºÍ×÷ÕßÐÅÏ¢¼°±¾ÉùÃ÷
http://www.5ilinux.com/lamp01.html
¹Ø¼ü×Ö£ºapache+mysql+php apache mysql php ÅäÖà lamp ·þÎñÆ÷ web
Linux+Apache+Mysql+PHPµäÐÍÅäÖÃ
µ÷ÊÔ»·¾³£ºRedhat9.0 Apache1.3.29 Mysql3.23.58 PHP4.3.4
LinuxϵͳµÄ°²×°ÎҾͲ»½²Á ......

Linux±ØÑ§µÄ60¸öÃüÁî (ת)

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 ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ