From: Michael Shigorin <mike@osdn.org.ua> To: ALT Devel discussion list <devel@lists.altlinux.org> Subject: Re: [devel] q: glibc malloc s*cks? Date: Tue, 16 Jan 2007 00:37:28 +0200 Message-ID: <20070115223727.GG30292@osdn.org.ua> (raw) In-Reply-To: <20070115213303.GA6086@osdn.org.ua> On Mon, Jan 15, 2007 at 11:33:03PM +0200, sr@altlinux.ru wrote: > > Скажите sr@, что glibc malloc уже давно использует mmap. > > См. тж. http://sourceware.org/ml/libc-alpha/2006-11/msg00061.html > Агащазблин. Скажем так -- "умеет использовать mmap", посмотри "Update in 2006:" по второй ссылке на libc-alpha@ (или в malloc.c@~1480) для уточнения нынешнего изменения порога между mmap и brk. > $ echo "int main() { return malloc( 1) ? 0 : 1; }" > 1.c > $ gcc 1.c > $ strace ./a.out [...] > brk(0) = 0x804a000 > brk(0x806b000) = 0x806b000 > exit_group(0) = ? > Process 6119 detached $ echo "int main() { return malloc( 2000000 ) ? 0 : 1; }" > 2.c $ gcc 2.c 2.c: In function 'main': 2.c:1: warning: incompatible implicit declaration of built-in function 'malloc' $ strace ./a.out execve("./a.out", ["./a.out"], [/* 71 vars */]) = 0 brk(0) = 0x804a000 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0f000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=135213, ...}) = 0 mmap2(NULL, 135213, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7eed000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\232b\1"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1171776, ...}) = 0 mmap2(NULL, 1177860, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7dcd000 mmap2(0xb7ee7000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11a) = 0xb7ee7000 mmap2(0xb7eea000, 10500, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7eea000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7dcc000 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7dcc6c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 mprotect(0xb7ee7000, 4096, PROT_READ) = 0 munmap(0xb7eed000, 135213) = 0 mmap2(NULL, 2002944, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7be3000 exit_group(0) = ? Process 10194 detached > $ rpm -q glibc > glibc-2.5-alt3 ditto, i586 -- ---- WBR, Michael Shigorin <mike@altlinux.ru> ------ Linux.Kiev http://www.linux.kiev.ua/
next prev parent reply other threads:[~2007-01-15 22:37 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2007-01-15 13:59 Michael Shigorin 2007-01-15 14:13 ` Dmitry V. Levin 2007-01-15 18:01 ` Michael Shigorin 2007-01-15 21:33 ` sr 2007-01-15 22:37 ` Michael Shigorin [this message] 2007-01-15 23:18 ` sr 2007-01-16 1:26 ` Dmitry V. Levin 2007-01-16 9:35 ` Michael Shigorin 2007-01-16 17:46 ` [devel] [JT] " Денис Смирнов 2007-01-15 23:19 ` [devel] q: " Dmitry V. Levin 2007-01-15 19:19 ` Денис Смирнов 2007-01-15 21:38 ` sr 2007-01-15 22:22 ` Konstantin A. Lepikhov
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