From: Theodore Ts'o <tytso-3s7WtUTddSA@public.gmane.org>
To: Sage Weil <sweil-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Trond Myklebust
<trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org>,
Zach Brown <zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Alexander Viro
<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
Linux FS-devel Mailing List
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux API Mailing List
<linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH RFC] vfs: add a O_NOMTIME flag
Date: Wed, 6 May 2015 19:21:46 -0400 [thread overview]
Message-ID: <20150506232146.GB12706@thunk.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1505061515550.28239-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
On Wed, May 06, 2015 at 03:19:13PM -0700, Sage Weil wrote:
> > Just out of curiosity, if you need to modify the application anyway,
> > why wouldn't use of fdatasync() when flushing be able to offer a
> > similar performance boost?
>
> Although fdatasync(2) doesn't have to update synchronously, it does
> eventually get written, and that can trigger lots of unwanted IO.
Something that might be worth trying out is using MS_LAZYTIME plus
fdatasync(2). That should significantly reduce the unwanted IO, while
eventually letting the mtimes get updated, plus allowing updates of
adjacent inodes in the same inode table block update the mtime "for
free".
Regards,
- Ted
next prev parent reply other threads:[~2015-05-06 23:21 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-06 22:00 [PATCH RFC] vfs: add a O_NOMTIME flag Zach Brown
2015-05-06 22:14 ` Trond Myklebust
2015-05-06 22:19 ` Sage Weil
[not found] ` <alpine.DEB.2.00.1505061515550.28239-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
2015-05-06 22:41 ` Zach Brown
[not found] ` <20150506224113.GA17282-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org>
2015-05-06 22:46 ` Sage Weil
2015-05-06 23:21 ` Theodore Ts'o [this message]
[not found] ` <1430949612-21356-1-git-send-email-zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-05-07 0:26 ` Dave Chinner
2015-05-07 17:20 ` Zach Brown
2015-05-07 18:43 ` Zach Brown
2015-05-08 1:01 ` Sage Weil
[not found] ` <alpine.DEB.2.00.1505071752520.28239-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
2015-05-08 1:23 ` Trond Myklebust
2015-05-08 15:19 ` Sage Weil
[not found] ` <CAHQdGtQjMHA8rVPkggB2zMz=k3O667+APH_1EY_2FtYmHL7-hw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-08 22:13 ` Dave Chinner
2015-05-08 22:24 ` Sage Weil
[not found] ` <alpine.DEB.2.00.1505081517470.28239-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
2015-05-10 23:13 ` Trond Myklebust
[not found] ` <CAHQdGtTFTN2XuvmarFZ9HPQV=cuhh7FosdHSrJME_U4htr=i8w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-11 7:31 ` Dave Chinner
2015-05-11 16:39 ` Sage Weil
2015-05-11 17:12 ` Trond Myklebust
[not found] ` <CAHQdGtT3rCf-ycAYw-=7HGaemg1+HfY8sw3+kb54VHONxDyP3w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-11 17:30 ` Sage Weil
2015-05-12 1:21 ` Dave Chinner
2015-05-12 23:12 ` Sage Weil
2015-05-13 0:57 ` Dave Chinner
[not found] ` <alpine.DEB.2.00.1505111020120.28239-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
2015-05-12 13:41 ` John Stoffel
2015-05-11 14:47 ` Theodore Ts'o
[not found] ` <20150511144719.GA14088-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-05-11 16:24 ` Sage Weil
[not found] ` <alpine.DEB.2.00.1505110920520.28239-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
2015-05-11 23:10 ` Theodore Ts'o
2015-05-12 5:08 ` Kevin Easton
[not found] ` <20150512050821.GA9404-Qr0l8DEfScZEV+tojptmR0B+6BGkLq7r@public.gmane.org>
2015-05-12 11:45 ` Austin S Hemmelgarn
[not found] ` <5551E7EB.8040301-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-12 13:54 ` John Stoffel
2015-05-12 14:36 ` J. Bruce Fields
[not found] ` <20150512143637.GA6370-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2015-05-12 14:53 ` Austin S Hemmelgarn
2015-05-12 21:51 ` Dave Chinner
2015-05-13 15:16 ` Austin S Hemmelgarn
2015-05-12 22:39 ` NeilBrown
[not found] ` <20150513083951.5eb63bc0-wvvUuzkyo1EYVZTmpyfIwg@public.gmane.org>
2015-07-14 13:13 ` Pavel Machek
2015-07-15 4:54 ` NeilBrown
2015-07-22 13:47 ` Pavel Machek
2015-05-12 21:35 ` Sage Weil
2015-05-13 12:32 ` Jan Kara
2015-05-08 14:43 ` Austin S Hemmelgarn
2015-05-08 17:11 ` Zach Brown
2015-05-08 14:29 ` John Stoffel
2015-07-14 11:50 ` Pavel Machek
[not found] ` <20150507172053.GA659-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org>
2015-05-07 19:09 ` Richard Weinberger
2015-05-07 19:53 ` Andy Lutomirski
[not found] ` <554BC4D8.9010507@nod.at>
2015-05-07 20:06 ` Andy Lutomirski
[not found] ` <CALCETrWNDMq0nK3ac-uZweV5BKK_yWTQHH5D0YkyEu7bcONo9g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-08 2:42 ` Dave Chinner
2015-07-14 11:44 ` Pavel Machek
2015-05-08 2:37 ` Dave Chinner
2015-05-08 3:24 ` Andy Lutomirski
[not found] ` <CALCETrUksu5ZB4QBfC8DMwYO2OFjfPW2eWsTweZGN_gybzcsmw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-08 14:44 ` Eric Sandeen
2015-05-11 20:36 ` J. Bruce Fields
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