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Subject: bug#18406: O_NOATIME patch
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--=====================_1027590036==_
Content-Type: text/plain; charset="us-ascii"
Wrote a quick (but clean) patch
to have O_NOATIME applied on file opens.
I find this handy for bulk find/grep when
I'd prefer not to update atime.
If the patch is of interest I'm willing
to improve it by having the feature
present conditionally on the appearance of
HAVE_WORKING_O_NOATIME
in 'config.h'.
Perhaps my choice of -N or
--no-atime are not agreeable to
all. Possibly the option does
not belong under "miscellaneous."
Easy to change.
--=====================_1027590036==_
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--=====================_1027590036==_--
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.503 (Entity 5.503) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: starlight.2014q3@HIDDEN Subject: bug#18406: Acknowledgement (O_NOATIME patch) Message-ID: <handler.18406.B.140986668618703.ack <at> debbugs.gnu.org> References: <6.2.5.6.2.20140904163056.072b70f0@HIDDEN> X-Gnu-PR-Message: ack 18406 X-Gnu-PR-Package: grep Reply-To: 18406 <at> debbugs.gnu.org Date: Thu, 04 Sep 2014 21:39:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-grep@HIDDEN If you wish to submit further information on this problem, please send it to 18406 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 18406: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D18406 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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X-Loop: help-debbugs@HIDDEN
Subject: bug#18406: O_NOATIME patch
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Date: Thu, 11 Sep 2014 13:13:54 -0700
From: Paul Eggert <eggert@HIDDEN>
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> If the patch is of interest I'm willing
> to improve it by having the feature
> present conditionally on the appearance of
> HAVE_WORKING_O_NOATIME
> in 'config.h'.
Thanks, but there's no need for that; just have 'grep' complain if the
option is used and O_NOATIME == 0.
I'm of two minds about this suggestion. On the one hand we don't want
to add an option like this to every utility that reads files. On the
other hand grep is used soooo often that it may be justifiable. What do
other people think?
If we add it, it should not have a single-letter option, though, and the
long option should be called "--atime-preserve" for compatibility with
tar, and the patch should also use FTS_NOATIME to avoid updating atime
on directories with grep -r, and it should be documented properly in
grep.texi and in 'grep --help' output and in NEWS (plus maybe write a
test case or two....).
X-Loop: help-debbugs@HIDDEN
Subject: bug#18406: O_NOATIME patch
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On 09/11/2014 02:13 PM, Paul Eggert wrote:
>> If the patch is of interest I'm willing
>> to improve it by having the feature
>> present conditionally on the appearance of
>> HAVE_WORKING_O_NOATIME
>> in 'config.h'.
>=20
> Thanks, but there's no need for that; just have 'grep' complain if the
> option is used and O_NOATIME =3D=3D 0.
>=20
> I'm of two minds about this suggestion. On the one hand we don't want
> to add an option like this to every utility that reads files. On the
> other hand grep is used soooo often that it may be justifiable. What d=
o
> other people think?
>=20
> If we add it, it should not have a single-letter option, though, and th=
e
> long option should be called "--atime-preserve" for compatibility with
> tar, and the patch should also use FTS_NOATIME to avoid updating atime
> on directories with grep -r, and it should be documented properly in
> grep.texi and in 'grep --help' output and in NEWS (plus maybe write a
> test case or two....).
Lots of work, but I like the idea. In fact, I proposed a similar idea
for coreutils' du several years ago, and the only reason I haven't
actually submitted a patch is _because_ it is a lot of this detail work.
--=20
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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Subject: bug#18406: O_NOATIME patch
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At 13:13 9/11/2014 -0700, Paul Eggert wrote:
>> If the patch is of interest I'm willing
>> to improve it by having the feature
>> present conditionally on the appearance of
>> HAVE_WORKING_O_NOATIME
>> in 'config.h'.
>
>Thanks, but there's no need for that; just
>have 'grep' complain if the option is used
>and O_NOATIME == 0.
Sure, that is a better approach.
>I'm of two minds about this suggestion. On
>the one hand we don't want to add an option
>like this to every utility that reads
>files. On the other hand grep is used soooo
>often that it may be justifiable. What do
>other people think?
I don't feel a compulsion to utilize
O_NOATIME all over the place--it really
seems like a specific use case to me which
is where one cares about and refers to
ATIME with something like 'ls -otru'
and one frequently runs
find * -type f -print | xargs egrep somestring
while trying to find code fragments.
For years it has annoyed me that the 'find/grep'
nukes ATIME values for the entire tree
one is working on.
>If we add it, it should not have a
>single-letter option, though, and the long
>option should be called "--atime-preserve"
>for compatibility with tar,
I specifically chose to not use the 'tar'
option because it has two variants:
a) =replace and b) =system in order to
avoid semantic confusion. The 'tar'
default is --atime-preserve=restore
which nukes CTIME values and is evil
in my opinion. But I don't feel
strongly about the naming choice here.
However I do feel strongly that a short
option should be defined. If one embraces
the feature it would be typed often.
>and the patch
>should also use FTS_NOATIME to avoid updating
>atime on directories with grep -r, and it
>should be documented properly in grep.texi
>and in 'grep --help' output and in NEWS (plus
>maybe write a test case or two....).
I can do the above if a decision is taken
to adopt the feature.
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Subject: bug#18406: O_NOATIME patch
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Another argument in favor of adding O_NOATIME
support to a limited set of utilities (just
'grep' IMO) is that recent 'ext4' file system
behavior defaults to a mode where ATIME is
updated only once relative to a given MTIME.
For O_NOATIME to be of use, one must care
enough about ATIME to add 'strictatime' to
the mount options in /etc/fstab.
I find this matters to me only in the context
of code development where seeing what has
been recently viewed or compiled (mainly
by me) is of interest. It's ok if ATIME
is nuked wholesale on occasion since the
usefulness of the value is short.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.