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From: NeilBrown <neilb@suse.de>
To: Trond Myklebust <trondmy@hammerspace.com>,
	"Anna.Schumaker\@Netapp.com" <Anna.Schumaker@Netapp.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jan Kara <jack@suse.cz>, Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, linux-nfs@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>
Subject: Writeback fixes for NFS - V3
Date: Thu, 16 Apr 2020 10:29:45 +1000	[thread overview]
Message-ID: <87wo6gs26e.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <87ftdgw58w.fsf@notabene.neil.brown.name>

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This is version 3 (I think) of my patches to improve NFS writeaback.

Changes:
 - the code for adding legacy values to /proc/vmstat was broken.
   I haven't taken the approach that Michal and Jan discussed but
   a simpler (I hope) approach that just seq_puts() the lines at an
   appropriate place.

 - I've modified the handling of PF_LOCAL_THROTTLE - sufficiently that
   I dropped Jan's reviewed-by.
   Rather than invoking the same behaviour as BDI_CAP_STRICTLIMIT,
   I now just use the part I needed.
   So if the global threshold is not exceeded, PF_LOCAL_THROTTLE tasks
   are not throttled.  This is the case for normal processes, but not
   when BDI_CAP_STRICTLIMIT is in effect.
   If the global threshold *is* exceeded, only then to we check the
   local per-bdi threshold.  If that is not exceeded then
   PF_LOCAL_THROTTLE again avoid any throttling.  Only if both the
   thresholds are exceeded are these tasks throttled.
   I think this is more refletive if what we actually need.


Thanks,
NeilBrown

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  parent reply	other threads:[~2020-04-16  0:30 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26  3:25 [PATCH/RFC] MM: fix writeback for NFS NeilBrown
2020-04-01 23:52 ` Writeback fixes " NeilBrown
2020-04-01 23:53   ` [PATCH 1/2] MM: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE NeilBrown
2020-04-01 23:54     ` [PATCH 2/2] Deprecate NR_UNSTABLE_NFS, use NR_WRITEBACK NeilBrown
2020-04-02 15:10       ` Christoph Hellwig
2020-04-02 22:35         ` [PATCH 2/2 - v2] MM: Discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead NeilBrown
2020-04-03  9:42           ` Jan Kara
2020-04-03 11:03             ` Michal Hocko
2020-04-06  0:14               ` NeilBrown
2020-04-06  7:41                 ` Michal Hocko
2020-04-06 23:28             ` NeilBrown
2020-04-07  7:33               ` Michal Hocko
2020-04-02 19:55       ` [PATCH 2/2] Deprecate NR_UNSTABLE_NFS, use NR_WRITEBACK Jan Kara
2020-04-02 16:35     ` [PATCH 1/2] MM: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE Jan Kara
2020-04-03 15:15     ` Michal Hocko
2020-04-03 21:40       ` NeilBrown
2020-04-06  7:44         ` Michal Hocko
2020-04-06  9:36           ` Jan Kara
2020-04-06 10:57             ` Michal Hocko
2020-04-06 11:58             ` NeilBrown
     [not found]   ` <20200402042644.17028-1-hdanton@sina.com>
2020-04-02  4:57     ` NeilBrown
2020-04-06 23:42   ` Writeback fixes for NFS - V2 NeilBrown
2020-04-06 23:43     ` [PATCH 1/2] MM: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE NeilBrown
2020-04-07 16:10       ` Chuck Lever
2020-04-16  0:29     ` NeilBrown [this message]
2020-04-16  0:30       ` [PATCH 1/2 V3] " NeilBrown
2020-04-16  6:54         ` Christoph Hellwig
2020-04-16 15:19         ` Jan Kara
2020-04-21  2:22           ` NeilBrown
2020-04-22 12:46             ` Jan Kara
2020-05-13  7:16               ` NeilBrown
2020-05-13  7:17                 ` [PATCH 1/2 V4] " NeilBrown
2020-05-15 11:10                   ` Jan Kara
2020-06-01  0:46                     ` Writeback fixes for NFS NeilBrown
2020-06-01  0:48                       ` [PATCH 1/2] MM: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE NeilBrown
2020-06-01  0:49                       ` [PATCH 2/2] MM: Discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead NeilBrown
2020-05-13  7:18                 ` [PATCH 2/2 V4] " NeilBrown
2020-05-15  9:59                   ` Jan Kara
2020-04-16  0:31       ` [PATCH 2/2 V3] " NeilBrown
2020-04-16  6:56         ` Christoph Hellwig
2020-04-16 15:24         ` Jan Kara

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