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: [PATCH 0/6] More graceful flusher thread memory reclaim wakeup
Date: Tue, 19 Sep 2017 13:53:01 -0600 [thread overview]
Message-ID: <1505850787-18311-1-git-send-email-axboe@kernel.dk> (raw)
We've had some issues with writeback in presence of memory reclaim
at Facebook, and this patch set attempts to fix it up. The real
functional change is the last patch in the series, the first 5 are
prep and cleanup patches.
The basic idea is that we have callers that call
wakeup_flusher_threads() with nr_pages == 0. This means 'writeback
everything'. For memory reclaim situations, we can end up queuing
a TON of these kinds of writeback units. This can cause softlockups
and further memory issues, since we allocate huge amounts of
struct wb_writeback_work to handle this writeback. Handle this
situation more gracefully.
--
Jens Axboe
WARNING: multiple messages have this Message-ID (diff)
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: [PATCH 0/6] More graceful flusher thread memory reclaim wakeup
Date: Tue, 19 Sep 2017 13:53:01 -0600 [thread overview]
Message-ID: <1505850787-18311-1-git-send-email-axboe@kernel.dk> (raw)
We've had some issues with writeback in presence of memory reclaim
at Facebook, and this patch set attempts to fix it up. The real
functional change is the last patch in the series, the first 5 are
prep and cleanup patches.
The basic idea is that we have callers that call
wakeup_flusher_threads() with nr_pages == 0. This means 'writeback
everything'. For memory reclaim situations, we can end up queuing
a TON of these kinds of writeback units. This can cause softlockups
and further memory issues, since we allocate huge amounts of
struct wb_writeback_work to handle this writeback. Handle this
situation more gracefully.
--
Jens Axboe
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next reply other threads:[~2017-09-19 19:53 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 19:53 Jens Axboe [this message]
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 19:53 ` Jens Axboe
2017-09-19 20:05 ` Johannes Weiner
2017-09-19 20:05 ` Johannes Weiner
2017-09-20 14:17 ` Jan Kara
2017-09-20 14:17 ` Jan Kara
2017-09-20 15:18 ` Jens Axboe
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 19:53 ` Jens Axboe
2017-09-19 20:05 ` Johannes Weiner
2017-09-19 20:05 ` Johannes Weiner
2017-09-20 14:19 ` Jan Kara
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 19:53 ` Jens Axboe
2017-09-19 20:06 ` Johannes Weiner
2017-09-19 20:06 ` Johannes Weiner
2017-09-20 14:35 ` Jan Kara
2017-09-20 14:35 ` Jan Kara
2017-09-20 15:19 ` Jens Axboe
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 19:53 ` Jens Axboe
2017-09-19 20:07 ` Johannes Weiner
2017-09-19 20:07 ` Johannes Weiner
2017-09-20 14:35 ` Jan Kara
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 19:53 ` Jens Axboe
2017-09-19 20:07 ` Johannes Weiner
2017-09-19 20:07 ` Johannes Weiner
2017-09-20 14:41 ` Jan Kara
2017-09-20 14:41 ` Jan Kara
2017-09-20 15:05 ` Jens Axboe
2017-09-20 15:05 ` Jens Axboe
2017-09-20 15:36 ` Jan Kara
2017-09-20 15:36 ` Jan Kara
2017-09-20 15:40 ` Jens Axboe
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 19:53 ` Jens Axboe
2017-09-19 20:18 ` Johannes Weiner
2017-09-19 20:18 ` Johannes Weiner
2017-09-19 20:39 ` Jens Axboe
2017-09-19 20:39 ` Jens Axboe
2017-09-20 1:57 ` Jens Axboe
2017-09-20 1:57 ` Jens Axboe
2017-09-20 3:10 ` Amir Goldstein
2017-09-20 3:10 ` Amir Goldstein
2017-09-20 4:13 ` Jens Axboe
2017-09-20 4:13 ` Jens Axboe
2017-09-20 6:05 ` Amir Goldstein
2017-09-20 6:05 ` Amir Goldstein
2017-09-20 12:35 ` Jens Axboe
2017-09-20 12:35 ` Jens Axboe
2017-09-20 14:43 ` Jan Kara
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 19:29 ` John Stoffel
2017-09-20 19:32 ` Jens Axboe
2017-09-20 19:32 ` Jens Axboe
2017-09-20 23:11 ` Johannes Weiner
2017-09-20 23:11 ` Johannes Weiner
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