From: Minchan Kim <minchan@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Rik van Riel <riel@redhat.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Dave Hansen <dave.hansen@intel.com>,
Namhyung Kim <namhyung@kernel.org>,
Minkyung Kim <minkyung88@lge.com>
Subject: Re: [PATCH v5 6/7] mm: Support address range reclaim
Date: Mon, 27 May 2013 17:24:13 +0900 [thread overview]
Message-ID: <20130527082413.GC5157@blaptop> (raw)
In-Reply-To: <20130521173332.637942da.akpm@linux-foundation.org>
On Tue, May 21, 2013 at 05:33:32PM -0700, Andrew Morton wrote:
> On Thu, 9 May 2013 16:21:28 +0900 Minchan Kim <minchan@kernel.org> wrote:
>
> > This patch adds address range reclaim of a process.
> > The requirement is following as,
> >
> > Like webkit1, it uses a address space for handling multi tabs.
> > IOW, it uses *one* process model so all tabs shares address space
> > of the process. In such scenario, per-process reclaim is rather
> > coarse-grained so this patch supports more fine-grained reclaim
> > for being able to reclaim target address range of the process.
> > For reclaim target range, you should use following format.
> >
> > echo [addr] [size-byte] > /proc/pid/reclaim
> >
> > The addr should be page-aligned.
> >
> > So now reclaim konb's interface is following as.
> >
> > echo file > /proc/pid/reclaim
> > reclaim file-backed pages only
> >
> > echo anon > /proc/pid/reclaim
> > reclaim anonymous pages only
> >
> > echo all > /proc/pid/reclaim
> > reclaim all pages
> >
> > echo 0x100000 8K > /proc/pid/reclaim
> > reclaim pages in (0x100000 - 0x102000)
>
> This might be going a bit far. The application itself can be modified
> to use fadvise/madvise/whatever to release unused pages and that's a
> better interface.
I agree. The webkit should be smarter and it's going on afaik but
let's think another usecase that makes snapshot image scenario
I mentioned in previous reply.
Admin should discard NOT-IMPORTANT pages without modifying application's
code.
In addition, maybe we need madvise(MADV_SWAPOUT_NOT_DONTNEED) for
anonymous pages if we don't have such feature.
>
> Athough it's a bit of a pipe-dream, I do think we should encourage
> userspace to go this path, rather than providing ways for hacky admin
> tools to go poking around in /proc/pid/maps and whacking apps
> externally.
>
> --
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--
Kind regards,
Minchan Kim
--
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next prev parent reply other threads:[~2013-05-27 8:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-09 7:21 [PATCH v5 0/7] Per process reclaim Minchan Kim
2013-05-09 7:21 ` [PATCH v5 1/7] mm: prevent to write out dirty page in CMA by may_writepage Minchan Kim
2013-05-09 7:21 ` [PATCH v5 2/7] mm: Per process reclaim Minchan Kim
2013-05-09 7:21 ` [PATCH v5 3/7] mm: make shrink_page_list with pages work from multiple zones Minchan Kim
2013-05-09 7:21 ` [PATCH v5 4/7] mm: Remove shrink_page Minchan Kim
2013-05-09 7:21 ` [PATCH v5 5/7] mm: Enhance per process reclaim to consider shared pages Minchan Kim
2013-05-09 7:21 ` [PATCH v5 6/7] mm: Support address range reclaim Minchan Kim
2013-05-22 0:33 ` Andrew Morton
2013-05-27 8:24 ` Minchan Kim [this message]
2013-05-09 7:21 ` [PATCH v5 7/7] add documentation about reclaim knob on proc.txt Minchan Kim
2013-05-21 23:16 ` [PATCH v5 0/7] Per process reclaim Andrew Morton
2013-05-27 8:12 ` Minchan Kim
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