Linux????????????й?????????λ????
???????????? ???????[ 2013/4/11 10:39:53 ] ????????
????????????????????????????????????????伴?????????????????????????????????С???????????/proc/{pid}/maps????????????????????????????????в????????????
# cat /proc/568/maps
00008000-0036a000 r-xp 00000000 00:0e 236 /home/hik/hicore
00372000-003a5000 rw-p 00362000 00:0e 236 /home/hik/hicore
003a5000-00e28000 rwxp 003a5000 00:00 0 [heap]
40000000-40005000 r-xp 00000000 01:00 94 /lib/ld-uClibc.so.0
416db000-41770000 rw-s c2005000 00:0f 68 /dev/mem
b51fc000-b5200000 rwxp b51fc000 00:00 0
…….
be1fc000-be200000 rwxp be1fc000 00:00 0
be93b000-be950000 rwxp befeb000 00:00 0 [stack]
????????У???r-xp??????????????????У?????????????????????????Σ????????????????????в??????С??????????????????????????????????????
????????У???rw-p????????????д????????У??????????????????????????Σ??????????????????????????????????
?????????У???rwxp????????????д??????У?????????????????????????????????Σ????????malloc????????????Ρ????????????????Σ????????????????????????????????棬???????????????Ρ?????????????????????????1GB??λ?????0x40000000?????????1GB??glibc??????mmap??????????????????檔
?????????У???????????????????????
?????????У?????mmap????????????????
?????????????У??????????????Σ???????????С????16K??
????????У??????????????????Σ?????????????????????????ж????????????????Ρ?
??????????????????????
????1?????????????????????????maps??????????
????2??????????????????????ò?????????????tmpfs??????£????????????????13M????????????????cache???????????????????????cache?????????????????????????????
????3?????????ramdisk??????檔
????4????????????????С???????????/proc/sys/vm/min_free_kbytes??????????????????С??
????5????????????????????????????????????????????????д???cache???????縺??????????skb?????????30M?????
???????????????й?????????Щ???
???????????????????????????glibc??????????????????????????????????????????????????????????????????????????????????????????檔
????????ε??????????????????????brk??mmap??brk????????????????mmap??????????????????????
????????????glibc????????????????????????????????????????glibc?????mmap?????????????????????????????brk???????????????????£???????128K??????????????????????
#include <malloc.h>
????Int mallopt(int param?? int value)
????Param????????M_MMAP_THRESHOLD??M_MMAP_MAX??
????Value??????????????λ???
????M_MMAP_THRESHOLD??glibc??????????淧???????÷????????????????????????mmap????????????棬???С??÷??????????????????????brk???????????????
????M_MMAP_MAX??y????ж????mmap???????ε???????
????????????????????У?????????????????й?????????y????maps???????????λ???mmap?ε???????????????????????????????????????????й??????mmap?????????????????????????????????ε????????????С?????????????????????????棬????????й?????????????????λ???á?
??????
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??????????????????
2023/3/23 14:23:39???д?ò??????????
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