[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20120203133823.GB17571@localhost>
Date: Fri, 3 Feb 2012 21:38:23 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: Amit Sahrawat <amit.sahrawat83@...il.com>
Cc: Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Johannes Weiner <jweiner@...hat.com>,
Amit Sahrawat <a.sahrawat@...sung.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm: make do_writepages() use plugging
On Fri, Feb 03, 2012 at 06:57:06PM +0530, Amit Sahrawat wrote:
> This will cover all the invocations for writepages to be called with
> plugging support.
Thanks. I'll test it on the major filesystems. But would you
name a few filesystems that are expected to benefit from it?
It's not obvious because some FS ->writepages eventually calls
generic_writepages() which already does plugging.
Thanks,
Fengguang
> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
> ---
> mm/page-writeback.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 363ba70..2bea32c 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -1866,14 +1866,18 @@ EXPORT_SYMBOL(generic_writepages);
>
> int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
> {
> + struct blk_plug plug;
> int ret;
>
> if (wbc->nr_to_write <= 0)
> return 0;
> +
> + blk_start_plug(&plug);
> if (mapping->a_ops->writepages)
> ret = mapping->a_ops->writepages(mapping, wbc);
> else
> ret = generic_writepages(mapping, wbc);
> + blk_finish_plug(&plug);
> return ret;
> }
>
> --
> 1.7.2.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists