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

linuxÄÚ´æ¹ÜÀí

    Ò³ÉêÇëµÄºËÐĵ÷ÓÃÊÇ: __alloc_pages(). Ò³ÉêÇë˳ÐòÈçÏ£º
    Ê×ÏÈÕÒ×î´óÄÜ·ûºÏµÄ¿é, Èç¹ûÒ»¸ö¿ÕÏп鲻ÄÜÂú×ã, ¸ü¸ßÒ»¼¶µÄ¿é½«·Ö¸î³É2¸öbuddy, Ò»¸ö±»Õ¼ÓÃ, Ò»¸ö·ÅÈëµÍÒ»¼¶µÄfreelist.
    µ±¿é±»ÊÍ·Åʱ, ¼ì²éÿ¶Ôbuddy, Èç¹ûÁ½Õß¶¼¿ÕÏÐ, °ÑËûÃǺϲ¢µ½¸ü¸ßÒ»¼¶µÄ¿éÊý×éÀïÈ¥, ͬʱ·ÅÈë¸ü¸ßÒ»¼¶µÄfreelist. Èç¹ûÒ»¸öbuddy»¹ÔÚ±»ÓÃ, ÄǴ˿齫¼ÓÈëµ½µ±Ç°¼¶µÄfreelist.
    Èç¹ûÒ»¸özoneÒѾ­Ã»ÓÐ×ã¹»¿ÕÏÐÒ³£¬¶øÇÒÓÖÐèÒª·ÖÅ䣬ÄÇÉêÇ뽫Í˵½ÏÂÒ»¼¶£¬Ò»°ã˳ÐòÊÇ£ºZONE_HIGHMEM --> ZONE_NORMAL --> ZONE_DMA. Èç¹û¿ÕÏÐÒ³»÷ÖÐpages_lowÃÅÏÞ£¬kswapd½«¿ªÊ¼ÊÍ·ÅÒ³¡£
http://hi.baidu.com/zengzhaonong/blog/item/bd4b15465d4104096b63e584.html
Ò³Ãæ¹ÜÀí»úÖÆµÄ³õ²½½¨Á¢
http://hi.baidu.com/mudgao/blog/item/57ebc03ebf065b3771cf6c73.html
ÿ¸öpg_data_tÊý¾Ý½á¹¹´ú±í×ÅһƬ¾ùÔȵġ¢Á¬ÐøµÄÄÚ´æ¿Õ¼ä¡£ÔÚÁ¬Ðø¿Õ¼äUMA½á¹¹ÖУ¬Ö»ÓÐÒ»¸ö½Úµãcontig_page_data£¬¶øÔÚNUMA½á¹¹»ò²»Á¬Ðø¿Õ¼äUMA½á¹¹ÖУ¬Óжà¸öÕâÑùµÄÊý¾Ý½á¹¹¡£
       ¼ÆËãÈý¸ö¹ÜÀíÇøµÄ´óС£¬²¢´æ·ÅÔÚzones_sizeÊý×éÖС£Èý¸ö¹ÜÀíÇøÊÇ£º
      ZONE_DMA£º´Ó0¡«16MB·ÖÅ䏸Õâ¸öÇø
ZONE_NORMAL£º´Ó16MB¡«896MB·ÖÅ䏸Õâ¸öÇø
ZONE_HIGHMEM £º896MBÒÔÉÏ·ÖÅ䏸Õâ¸öÇø
arch/xxx/kernel/head.S
init/main.c: start_kernel()->setup_arch()
arch/xxx/kernel/setup.c->init_bootmem_node()
                                         free_bootmem()
                                         reserve_bootmem()
                                &nbs


Ïà¹ØÎĵµ£º

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 ......

Linux ÏÂc/c++ ±àÒëÆ÷

Gcc¼ò½é
LinuxϵͳϵÄgcc£¨GNU C Compiler£©ÊÇGNUÍÆ³öµÄ¹¦ÄÜÇ¿´ó¡¢ÐÔÄÜÓÅÔ½µÄ¶àƽ̨±àÒëÆ÷£¬ÊÇGNUµÄ´ú±í×÷Æ·Ö®Ò»¡£gccÊÇ¿ÉÒÔÔÚ¶àÖÖÓ²ÌåÆ½Ì¨ÉϱàÒë³ö¿ÉÖ´ÐгÌÐòµÄ³¬¼¶±àÒëÆ÷£¬ÆäÖ´ÐÐЧÂÊÓëÒ»°ãµÄ±àÒëÆ÷Ïà±Èƽ¾ùЧÂÊÒª¸ß20%~30%¡£
gcc ±àÒëÆ÷Äܽ«C¡¢C++ÓïÑÔÔ´³ÌÐò¡¢»ã³Ìʽ»¯ÐòºÍÄ¿±ê³ÌÐò±àÒë¡¢Á¬½Ó³É¿ÉÖ´ÐÐÎļþ£¬Èç¹ûûÓи ......

linux µ÷ÊÔ¹¤¾ß

 “¹¤ÓûÉÆÆäÊ ±ØÏÈÀûÆäÆ÷”ÏÖÔÚ½«Ò»Ð©³£¼ûµÄµ÷ÊÔ¹¤¾ß½øÐÐÒ»ÏÂ×ܽá.
 ¡¾1¡¿
Ãû³Æ£ºMEMWATCH
¹¦ÄÜ£º
    1¡¢MEMWATCH Ö§³Ö ANSI C
    2¡¢ËüÌṩ½á¹ûÈÕÖ¾¼Í¼
    3¡¢Äܼì²âË«ÖØÊÍ·Å£¨double-free£©
    4¡¢´íÎóÊÍ·Å£¨erroneous f ......

linuxÖи÷ÖÖÐźŽéÉÜ

1.SIGHUPÐźÅ
     UNIXÖнø³Ì×éÖ¯½á¹¹Îª session (»á»°)°üº¬Ò»¸öǰ̨½ø³Ì×é¼°Ò»¸ö»ò¶à¸öºǫ́½ø³Ì×飬һ¸ö½ø³Ì×é°üº¬¶à¸ö½ø³Ì¡£Ò»¸ösession¿ÉÄÜ»áÓÐÒ»¸ösessionÊ×½ø³Ì£¬¶øÒ»¸ösessionÊ×½ø³Ì¿ÉÄÜ»áÓÐÒ»¸ö¿ØÖÆÖÕ¶Ë¡£Ò»¸ö½ø³Ì×é¿ÉÄÜ»áÓÐÒ»¸ö½ø³Ì×éÊ×½ø³Ì¡£½ø³Ì×éÊ×½ø³ÌµÄ½ø³ÌIDÓë¸Ã½ø³Ì×éIDÏàµÈ¡£Õâ ......

linuxʵÓÃÃüÁîÏê½â


1. ´´½¨Ä¿Â¼
     mkdir
     NO1. ÔÚµ±Ç°Â·¾¶´´½¨Ò»¼¶Ä¿Â¼
          [root@rehat root]# mkdir test
     NO2. ÔÚµ±Ç°Â·¾¶´´½¨¶à¼¶Ä¿Â¼
          [roo ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ