From: Andrew Morton <akpm@linux-foundation.org>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.cz>,
Matthias Wirth <matthias.wirth@gmail.com>,
Lukas Senger <lukas@fridolin.com>,
Matthew Wilcox <matthew@wil.cx>, Jeff Layton <jlayton@redhat.com>,
"J. Bruce Fields" <bfields@fieldses.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Rik van Riel <riel@redhat.com>, Lisa Du <cldu@marvell.com>,
Paul Mackerras <paulus@samba.org>,
Sasha Levin <sasha.levin@oracle.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Fengguang Wu <fengguang.wu@intel.com>,
Shaohua Li <shli@kernel.org>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Minchan Kim <minchan@kernel.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Steven Whitehouse <swhiteho@redhat.com>,
Mel Gorman <mgorman@suse.de>,
Cody P Schafer <cody@linux.vnet.ibm.com>,
Jiang Liu <liuj97@gmail.com>,
David Rientjes <rientjes@google.com>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Lukas Czerner <lczerner@redhat.com>,
Damien Ramonda <damien.ramonda@intel.com>,
Mark Rutland <mark.rutland@arm.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH] mm: implement POSIX_FADV_NOREUSE
Date: Tue, 11 Mar 2014 14:27:29 -0700 [thread overview]
Message-ID: <20140311142729.1e3e4e51186db4c8ee49a9f4@linux-foundation.org> (raw)
In-Reply-To: <531F2ABA.6060804@linux.intel.com>
On Tue, 11 Mar 2014 08:24:42 -0700 Dave Hansen <dave.hansen@linux.intel.com> wrote:
> On 03/11/2014 07:06 AM, Michal Hocko wrote:
> >> > In our implementation pages marked with the NoReuse flag are added to
> >> > the tail of the LRU list the first time they are read. Therefore they
> >> > are the first to be reclaimed.
> > page flags are really scarce and I am not sure this is the best usage of
> > the few remaining slots.
>
> Yeah, especially since the use so so transient.
Yes, we're short on page flags.
> This also looks to ignore the reuse flag for existing pages.
And it sets PG_noreuse on new pages whether or not they were within the
fadvise range (offset...offset+len). It's not really an fadvise
operation at all.
A practical implementation might go through the indicated pages, clear
any referenced bits and move them to the tail of the inactive LRU?
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next prev parent reply other threads:[~2014-03-11 21:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-11 10:25 [PATCH] mm: implement POSIX_FADV_NOREUSE Matthias Wirth
2014-03-11 14:06 ` Michal Hocko
2014-03-11 15:24 ` Dave Hansen
2014-03-11 21:27 ` Andrew Morton [this message]
2014-03-12 11:59 ` Lukas Senger
2014-03-12 14:46 ` Michal Hocko
2014-03-12 16:05 ` Dave Hansen
2014-03-13 12:40 ` Lukas Senger
2014-03-13 18:43 ` [PATCHv2] " Matthias Wirth
2014-03-13 20:01 ` Andrew Morton
2014-03-14 12:34 ` Lukas Senger
2014-03-14 15:52 ` [PATCHv3] " Matthias Wirth
2014-03-18 15:14 ` Michal Hocko
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