Messages in this thread | | | From | Denis Vlasenko <> | Subject | 2.4.16+perl+noatime: bug? | Date | Wed, 10 Apr 2002 10:34:59 -0200 |
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Weird problem: perl can't read file's atime if fs is mounted noatime! Was found during Mozilla 0.9.9 build. Verified to be related to mount -o noatime (i.e. it works fine on normally mounted fs)! Can you imagine this?
See http://bugzilla.mozilla.org/show_bug.cgi?id=136123 for full story. Abridged version:
Was getting perl errors in config/make-jars.pl: =============================================== unlink $destPath; # in case we had a symlink on unix copy($file, $destPath) || die "copy($file, $destPath) failed: $!";
# fix the mod date so we don't jar everything (is this faster than just jarring everything?) ======> #vda: my $atime = stat($file)->atime || die $!; #vda: my $mtime = stat($file)->mtime || die $!; #vda: utime($atime, $mtime, $destPath);
return 1; } return 0; } ========= Commented offending lines (those with #vda: above). This helped.
[snip]
------- Additional Comment #4 From Vlasenko Denis 2002-04-09 01:05 ------- >I faintly recall a kernel option to disable atime
Yes! This is it. I mount all my filesystems -o noatime. But how can this be related? Build process should never pay attention to atime. Only mtime/ctime is important, right?
Nevertheless, I'll enable atime update and report back. (this means tomorrow, I'm playing with 0.9.9 at home, not here)
[snip]
------- Additional Comment #13 From Vlasenko Denis 2002-04-09 21:57 ------- >you're saying that you had no trouble whatsoever running >the mozilla build or just the test perl script?
Only test script. Have to compile 2.5.7 at home to test mozilla.
>I see nothing to indicate that the >usage of atime is wrong or non-standard.
atime is standard, thats ok, but using atime in build process is _logically_ wrong. Remember make? It compares *mtime* of source and target files in order to decide which target needs rebuilding! atime is _irrelevant_.
>FWIW, I mounted my build partition using noatime and I was >not able to reproduce the problem. I'm running RH's 2.4.9-31.
I tried that at home: noatime mount + fresh configure+make, got an error. normal mount + fresh configure+make, everything is ok. (2.4.16 kernel, had no opportunity to try 2.5.7 - was compiling KDE 3.0 at the same time and having some sleep)
Tried to look into perl sources (there are a handful of stat* files) but since I don't know perl, I was scared by ugly syntax and ran away. YMMV. :-) -- vda - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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