From: "Hillf Danton" <hillf.zj@alibaba-inc.com>
To: "'Johannes Weiner'" <hannes@cmpxchg.org>,
"'Andrew Morton'" <akpm@linux-foundation.org>
Cc: "'Jia He'" <hejianet@gmail.com>,
"'Michal Hocko'" <mhocko@suse.cz>,
"'Mel Gorman'" <mgorman@suse.de>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>, <kernel-team@fb.com>
Subject: Re: [PATCH 6/9] mm: don't avoid high-priority reclaim on memcg limit reclaim
Date: Thu, 02 Mar 2017 11:32:47 +0800 [thread overview]
Message-ID: <078101d29305$aa290420$fe7b0c60$@alibaba-inc.com> (raw)
In-Reply-To: <20170228214007.5621-7-hannes@cmpxchg.org>
On March 01, 2017 5:40 AM Johannes Weiner wrote:
>
> 246e87a93934 ("memcg: fix get_scan_count() for small targets") sought
> to avoid high reclaim priorities for memcg by forcing it to scan a
> minimum amount of pages when lru_pages >> priority yielded nothing.
> This was done at a time when reclaim decisions like dirty throttling
> were tied to the priority level.
>
> Nowadays, the only meaningful thing still tied to priority dropping
> below DEF_PRIORITY - 2 is gating whether laptop_mode=1 is generally
> allowed to write. But that is from an era where direct reclaim was
> still allowed to call ->writepage, and kswapd nowadays avoids writes
> until it's scanned every clean page in the system. Potential changes
> to how quick sc->may_writepage could trigger are of little concern.
>
> Remove the force_scan stuff, as well as the ugly multi-pass target
> calculation that it necessitated.
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> ---
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
next prev parent reply other threads:[~2017-03-02 3:33 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-28 21:39 [PATCH 0/9] mm: kswapd spinning on unreclaimable nodes - fixes and cleanups Johannes Weiner
2017-02-28 21:39 ` [PATCH 1/9] mm: fix 100% CPU kswapd busyloop on unreclaimable nodes Johannes Weiner
2017-03-02 3:23 ` Hillf Danton
2017-03-02 23:30 ` Shakeel Butt
2017-03-03 1:26 ` Minchan Kim
2017-03-03 7:59 ` Michal Hocko
2017-03-06 1:37 ` Minchan Kim
2017-03-06 16:24 ` Johannes Weiner
2017-03-07 0:59 ` Hillf Danton
2017-03-07 7:28 ` Minchan Kim
2017-03-07 10:17 ` Michal Hocko
2017-03-07 16:56 ` Johannes Weiner
2017-03-09 14:20 ` Mel Gorman
2017-02-28 21:40 ` [PATCH 2/9] mm: fix check for reclaimable pages in PF_MEMALLOC reclaim throttling Johannes Weiner
2017-03-01 15:02 ` Michal Hocko
2017-03-02 3:25 ` Hillf Danton
2017-02-28 21:40 ` [PATCH 3/9] mm: remove seemingly spurious reclaimability check from laptop_mode gating Johannes Weiner
2017-03-01 15:06 ` Michal Hocko
2017-03-01 15:17 ` Mel Gorman
2017-03-02 3:27 ` Hillf Danton
2017-02-28 21:40 ` [PATCH 4/9] mm: remove unnecessary reclaimability check from NUMA balancing target Johannes Weiner
2017-03-01 15:14 ` Michal Hocko
2017-03-02 3:28 ` Hillf Danton
2017-02-28 21:40 ` [PATCH 5/9] mm: don't avoid high-priority reclaim on unreclaimable nodes Johannes Weiner
2017-03-01 15:21 ` Michal Hocko
2017-03-02 3:31 ` Hillf Danton
2017-02-28 21:40 ` [PATCH 6/9] mm: don't avoid high-priority reclaim on memcg limit reclaim Johannes Weiner
2017-03-01 15:40 ` Michal Hocko
2017-03-01 17:36 ` Johannes Weiner
2017-03-01 19:13 ` Michal Hocko
2017-03-02 3:32 ` Hillf Danton [this message]
2017-02-28 21:40 ` [PATCH 7/9] mm: delete NR_PAGES_SCANNED and pgdat_reclaimable() Johannes Weiner
2017-03-01 15:41 ` Michal Hocko
2017-03-02 3:34 ` Hillf Danton
2017-02-28 21:40 ` [PATCH 8/9] Revert "mm, vmscan: account for skipped pages as a partial scan" Johannes Weiner
2017-03-01 15:51 ` Michal Hocko
2017-03-02 3:36 ` Hillf Danton
2017-02-28 21:40 ` [PATCH 9/9] mm: remove unnecessary back-off function when retrying page reclaim Johannes Weiner
2017-03-01 14:56 ` Michal Hocko
2017-03-02 3:37 ` Hillf Danton
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