From: Michal Hocko <mhocko@kernel.org>
To: Roman Gushchin <guro@fb.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org, kernel-team@fb.com,
Vlastimil Babka <vbabka@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH] mm: don't show nr_indirectly_reclaimable in /proc/vmstat
Date: Thu, 26 Apr 2018 22:03:31 +0200 [thread overview]
Message-ID: <20180426200331.GZ17484@dhcp22.suse.cz> (raw)
In-Reply-To: <20180425191422.9159-1-guro@fb.com>
On Wed 25-04-18 20:14:22, Roman Gushchin wrote:
> Don't show nr_indirectly_reclaimable in /proc/vmstat,
> because there is no need in exporting this vm counter
> to the userspace, and some changes are expected
> in reclaimable object accounting, which can alter
> this counter.
>
> Signed-off-by: Roman Gushchin <guro@fb.com>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Alexander Viro <viro@zeniv.linux.org.uk>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
This is quite a hack. I would much rather revert the counter and fixed
it the way Vlastimil has proposed. But if there is a strong opposition
to the revert then this is probably the simples thing to do. Therefore
Unhappy-Acked-by: Michal Hocko <mhocko@suse.com>
> ---
> mm/vmstat.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 536332e988b8..a2b9518980ce 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -1161,7 +1161,7 @@ const char * const vmstat_text[] = {
> "nr_vmscan_immediate_reclaim",
> "nr_dirtied",
> "nr_written",
> - "nr_indirectly_reclaimable",
> + "", /* nr_indirectly_reclaimable */
>
> /* enum writeback_stat_item counters */
> "nr_dirty_threshold",
> @@ -1740,6 +1740,10 @@ static int vmstat_show(struct seq_file *m, void *arg)
> unsigned long *l = arg;
> unsigned long off = l - (unsigned long *)m->private;
>
> + /* Skip hidden vmstat items. */
> + if (*vmstat_text[off] == '\0')
> + return 0;
> +
> seq_puts(m, vmstat_text[off]);
> seq_put_decimal_ull(m, " ", *l);
> seq_putc(m, '\n');
> --
> 2.14.3
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-04-26 20:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 19:14 [PATCH] mm: don't show nr_indirectly_reclaimable in /proc/vmstat Roman Gushchin
2018-04-25 19:36 ` Vlastimil Babka
2018-04-25 19:37 ` David Rientjes
2018-04-25 21:01 ` Roman Gushchin
2018-04-25 21:20 ` David Rientjes
2018-04-26 20:03 ` Michal Hocko [this message]
2018-04-26 21:55 ` David Rientjes
2018-04-27 9:17 ` Vlastimil Babka
2018-04-27 10:55 ` Roman Gushchin
2018-04-27 11:06 ` Vlastimil Babka
2018-04-27 18:41 ` David Rientjes
2018-04-27 18:57 ` Matthew Wilcox
2018-04-30 15:30 ` Vlastimil Babka
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