From: NeilBrown <neilb@suse.de>
To: Michal Hocko <mhocko@kernel.org>, Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@infradead.org>,
Trond Myklebust <trondmy@hammerspace.com>,
"Anna.Schumaker\@Netapp.com" <Anna.Schumaker@netapp.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-nfs@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2 - v2] MM: Discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead.
Date: Mon, 06 Apr 2020 10:14:16 +1000 [thread overview]
Message-ID: <87pnclwjvr.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <20200403110358.GB22681@dhcp22.suse.cz>
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On Fri, Apr 03 2020, Michal Hocko wrote:
> On Fri 03-04-20 11:42:20, Jan Kara wrote:
> [...]
>> > diff --git a/mm/vmstat.c b/mm/vmstat.c
>> > index 78d53378db99..d1291537bbb9 100644
>> > --- a/mm/vmstat.c
>> > +++ b/mm/vmstat.c
>> > @@ -1162,7 +1162,6 @@ const char * const vmstat_text[] = {
>> > "nr_file_hugepages",
>> > "nr_file_pmdmapped",
>> > "nr_anon_transparent_hugepages",
>> > - "nr_unstable",
>> > "nr_vmscan_write",
>> > "nr_vmscan_immediate_reclaim",
>> > "nr_dirtied",
>>
>> This is probably the most tricky to deal with given how /proc/vmstat is
>> formatted. OTOH for this file there's good chance we'd get away with just
>> deleting nr_unstable line because there are entries added to it in the
>> middle (e.g. in 60fbf0ab5da1 last September) and nobody complained yet.
>>
>> What do mm people think? How were changes to vmstat counters handled in the
>> past?
>
> Adding new counters in the middle seems to be generally OK. I would be
> more worried about removing counters though. So if we can simply print a
> phone value at the very end then this should be a reasonable workaround.
At the very end?
Do you mean not have "nr_unstable 0" appear at all, but having "dummy 0"
appear at the end just so that the number of lines doesn't decrease?
Am I misunderstanding?
Thanks,
NeilBrown
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next prev parent reply other threads:[~2020-04-06 0:14 UTC|newest]
Thread overview: 43+ 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 [this message]
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
2020-04-02 4:26 ` Hillf Danton
2020-04-02 4:57 ` NeilBrown
2020-04-06 3:58 ` Hillf Danton
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 ` Writeback fixes for NFS - V3 NeilBrown
2020-04-16 0:30 ` [PATCH 1/2 V3] MM: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE 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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