Date: Fri, 17 Jul 2009 19:32:04 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/libexec/rtld-elf map_object.c Message-ID: <200907171932.n6HJWQQQ014408@repoman.freebsd.org>
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kib 2009-07-17 19:32:04 UTC
FreeBSD src repository
Modified files:
libexec/rtld-elf map_object.c
Log:
SVN rev 195743 on 2009-07-17 19:32:04Z by kib
Only perform .bss mapping and cleaning operations when segment file size
is not equal to its memory size.
This eliminates unneeded clearing of the text segment that often
happens due to text end not being page-aligned.
For instance,
$ readelf -l /lib/libedit.so.6
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000000 0x00000000 0x00000000 0x139e1 0x139e1 R E 0x1000
LOAD 0x014000 0x00014000 0x00014000 0x00f04 0x00f14 RW 0x1000
DYNAMIC 0x014cc4 0x00014cc4 0x00014cc4 0x000d0 0x000d0 RW 0x4
$ procstat -v $$ (for /bin/sh)
68585 0x28097000 0x280aa000 r-x 6 0 21 14 CN vn /lib/libedit.so.6
68585 0x280aa000 0x280ab000 r-x 1 0 1 0 CN vn /lib/libedit.so.6 <==
68585 0x280ab000 0x280ac000 rwx 1 0 1 0 CN vn /lib/libedit.so.6
Note the splitted map entry marked by '<=='.
Reviewed by: kan
Approved by: re (kensmith)
MFC after: 1 month
Revision Changes Path
1.22 +27 -21 src/libexec/rtld-elf/map_object.c
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