From: Jens Axboe <axboe@kernel.dk>
To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org
Cc: hannes@cmpxchg.org, clm@fb.com, jack@suse.cz
Subject: Re: [PATCH 6/6] fs-writeback: only allow one inflight and pending !nr_pages flush
Date: Tue, 19 Sep 2017 19:57:10 -0600 [thread overview]
Message-ID: <dd57027c-55f3-6d9d-7fd6-a842bb16e11f@kernel.dk> (raw)
In-Reply-To: <1505850787-18311-7-git-send-email-axboe@kernel.dk>
On 09/19/2017 01:53 PM, Jens Axboe wrote:
> @@ -948,15 +949,25 @@ static void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
> bool range_cyclic, enum wb_reason reason)
> {
> struct wb_writeback_work *work;
> + bool zero_pages = false;
>
> if (!wb_has_dirty_io(wb))
> return;
>
> /*
> - * If someone asked for zero pages, we write out the WORLD
> + * If someone asked for zero pages, we write out the WORLD.
> + * Places like vmscan and laptop mode want to queue a wakeup to
> + * the flusher threads to clean out everything. To avoid potentially
> + * having tons of these pending, ensure that we only allow one of
> + * them pending and inflight at the time
> */
> - if (!nr_pages)
> + if (!nr_pages) {
> + if (test_bit(WB_zero_pages, &wb->state))
> + return;
> + set_bit(WB_zero_pages, &wb->state);
> nr_pages = get_nr_dirty_pages();
> + zero_pages = true;
> + }
Later fix added here to ensure we clear WB_zero_pages, if work
allocation fails:
work = kzalloc(sizeof(*work),
GFP_NOWAIT | __GFP_NOMEMALLOC | __GFP_NOWARN);
if (!work) {
if (zero_pages)
clear_bit(WB_zero_pages, &wb->state);
[...]
Updated patch here:
http://git.kernel.dk/cgit/linux-block/commit/?h=writeback-fixup&id=21ea70657894fda9fccf257543cbec112b2813ef
--
Jens Axboe
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next prev parent reply other threads:[~2017-09-20 1:57 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 19:53 [PATCH 0/6] More graceful flusher thread memory reclaim wakeup Jens Axboe
2017-09-19 19:53 ` [PATCH 1/6] buffer: cleanup free_more_memory() flusher wakeup Jens Axboe
2017-09-19 20:05 ` Johannes Weiner
2017-09-20 14:17 ` Jan Kara
2017-09-20 15:18 ` Jens Axboe
2017-09-19 19:53 ` [PATCH 2/6] fs-writeback: provide a wakeup_flusher_threads_bdi() Jens Axboe
2017-09-19 20:05 ` Johannes Weiner
2017-09-20 14:19 ` Jan Kara
2017-09-19 19:53 ` [PATCH 3/6] page-writeback: pass in '0' for nr_pages writeback in laptop mode Jens Axboe
2017-09-19 20:06 ` Johannes Weiner
2017-09-20 14:35 ` Jan Kara
2017-09-20 15:19 ` Jens Axboe
2017-09-19 19:53 ` [PATCH 4/6] fs-writeback: make wb_start_writeback() static Jens Axboe
2017-09-19 20:07 ` Johannes Weiner
2017-09-20 14:35 ` Jan Kara
2017-09-19 19:53 ` [PATCH 5/6] fs-writeback: move nr_pages == 0 logic to one location Jens Axboe
2017-09-19 20:07 ` Johannes Weiner
2017-09-20 14:41 ` Jan Kara
2017-09-20 15:05 ` Jens Axboe
2017-09-20 15:36 ` Jan Kara
2017-09-20 15:40 ` Jens Axboe
2017-09-19 19:53 ` [PATCH 6/6] fs-writeback: only allow one inflight and pending !nr_pages flush Jens Axboe
2017-09-19 20:18 ` Johannes Weiner
2017-09-19 20:39 ` Jens Axboe
2017-09-20 1:57 ` Jens Axboe [this message]
2017-09-20 3:10 ` Amir Goldstein
2017-09-20 4:13 ` Jens Axboe
2017-09-20 6:05 ` Amir Goldstein
2017-09-20 12:35 ` Jens Axboe
2017-09-20 14:43 ` Jan Kara
2017-09-20 19:29 ` [PATCH 0/6] More graceful flusher thread memory reclaim wakeup John Stoffel
2017-09-20 19:32 ` Jens Axboe
2017-09-20 23:11 ` Johannes Weiner
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