From: Mike Frysinger <vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org>
To: Andrea Righi <andrea-oIIqvOZpAevzfdHfmsDf5w@public.gmane.org>
Cc: Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>,
Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v2] fadvise: introduce POSIX_FADV_DONTNEED_FS
Date: Wed, 27 Apr 2011 14:25:17 -0400 [thread overview]
Message-ID: <BANLkTinG+ooNRH-VUjKdaHixbGCwk5XoXA@mail.gmail.com> (raw)
In-Reply-To: <1303928027-5100-1-git-send-email-andrea-oIIqvOZpAevzfdHfmsDf5w@public.gmane.org>
On Wed, Apr 27, 2011 at 14:13, Andrea Righi wrote:
> Introduce a new fadvise flag to drop page cache pages of a single
> filesystem.
>
> At the moment it is possible to drop page cache pages via
> /proc/sys/vm/drop_pagecache or via posix_fadvise(POSIX_FADV_DONTNEED).
>
> The first method drops the whole page cache while the second can be used
> to drop page cache pages of a single file descriptor. However, there's
> not a simple way to drop all the pages of a filesystem (we could scan
> all the file descriptors and use posix_fadvise(POSIX_FADV_DONTNEED), but
> this solution obviously doesn't scale well).
what if you open the mount point and use POSIX_FADV_DONTNEED on that
dir handle ? if you required write access for that level, it'd also
implicitly take care of the permission issue. but maybe this is just
trying to fit existing code in the wrong way.
-mike
next prev parent reply other threads:[~2011-04-27 18:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-27 18:13 [PATCH v2] fadvise: introduce POSIX_FADV_DONTNEED_FS Andrea Righi
[not found] ` <1303928027-5100-1-git-send-email-andrea-oIIqvOZpAevzfdHfmsDf5w@public.gmane.org>
2011-04-27 18:25 ` Mike Frysinger [this message]
2011-04-28 9:35 ` Andrea Righi
2011-04-27 18:33 ` Matthew Wilcox
[not found] ` <20110427183308.GA16716-6jwH94ZQLHl74goWV3ctuw@public.gmane.org>
2011-04-27 18:39 ` Mike Frysinger
2011-04-27 18:47 ` Matthew Wilcox
[not found] ` <20110427184756.GB16716-6jwH94ZQLHl74goWV3ctuw@public.gmane.org>
2011-04-27 18:49 ` Mike Frysinger
2011-04-28 9:29 ` Andrea Righi
2011-05-04 21:44 ` Andrew Morton
[not found] ` <20110504144411.7f32c00c.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-05-04 22:09 ` Andrea Righi
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