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SubjectRe: [PATCH] fix obj vma sorting
On Wed, Apr 09, 2003 at 08:20:28PM +0100, Hugh Dickins wrote:
> Thanks. Yes, seems conclusive, but I'm puzzled.
> I hope a fresh pair of eyes can work it out for us.

They're pounding ->i_shared_sem, which you already knew.

Here's what I see as far as number of processes mapping what. It seems
to indicate large scale sharing occurs for a number of objects, which
could very well lead to mutual interference for several objects.

It seems to indicate more than glibc is involved, and that there's some
shm involved with large vma count files on "normal" systems as well.

-- wli

how many processes were mapping a given file
(i.e. remove dups in /proc/$PID/maps)
---------------------------------------------
/lib/libc-2.2.5.so 151
/lib/ld-2.2.5.so 151
/lib/libnsl-2.2.5.so 110
/lib/libnss_compat-2.2.5.so 107
/lib/libdl-2.2.5.so 85
/lib/libm-2.2.5.so 70
/lib/libncurses.so.5.2 65
/usr/X11R6/lib/libX11.so.6.2 44
/usr/X11R6/lib/libSM.so.6.0 43
/usr/X11R6/lib/libICE.so.6.3 43
/lib/libcap.so.1.10 39
/usr/lib/zsh/4.0.4/zsh/zle.so 35
/usr/lib/zsh/4.0.4/zsh/rlimits.so 35
/usr/lib/zsh/4.0.4/zsh/complete.so 35
/usr/lib/zsh/4.0.4/zsh/compctl.so 35
/usr/X11R6/lib/libXpm.so.4.11 35
/bin/zsh4 35
/lib/libnss_files-2.2.5.so 32
/usr/lib/libz.so.1.1.4 31
/usr/X11R6/lib/libXext.so.6.4 24
/lib/libcrypt-2.2.5.so 22
/lib/libresolv-2.2.5.so 21
/lib/libnss_dns-2.2.5.so 21

How many vma's total mapped a given file:
-----------------------------------------
/lib/libc-2.2.5.so 302
/lib/ld-2.2.5.so 302
/lib/libnsl-2.2.5.so 220
/SYSV00000000 220
/lib/libnss_compat-2.2.5.so 214
/lib/libdl-2.2.5.so 170
/lib/libm-2.2.5.so 140
/lib/libncurses.so.5.2 130
/usr/X11R6/lib/libX11.so.6.2 88
/usr/X11R6/lib/libSM.so.6.0 86
/usr/X11R6/lib/libICE.so.6.3 86
/lib/libcap.so.1.10 78
/usr/lib/zsh/4.0.4/zsh/zle.so 70
/usr/X11R6/lib/libXpm.so.4.11 70
/bin/zsh4 70
/lib/libnss_files-2.2.5.so 64
/usr/lib/libz.so.1.1.4 62
/usr/X11R6/lib/libXext.so.6.4 48
/lib/libcrypt-2.2.5.so 44
/lib/libresolv-2.2.5.so 42
/lib/libnss_dns-2.2.5.so 42
/usr/X11R6/lib/libXt.so.6.0 40
/usr/X11R6/bin/wterm 40
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