From: Yosry Ahmed <yosryahmed@google.com>
To: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Muchun Song <muchun.song@linux.dev>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/7] memcg: reduce memory for the lruvec and memcg stats
Date: Fri, 26 Apr 2024 18:18:50 -0700 [thread overview]
Message-ID: <CAJD7tkbj1hdka1wJiRZA+nOXFb3YW3adN=CENp2F+FACm7N+Tg@mail.gmail.com> (raw)
In-Reply-To: <uewheydidpkiqywtc4m6dcmvlfj7raocpngtbqocksxvf4nyz4@srxnazpqxvzy>
On Fri, Apr 26, 2024 at 6:16 PM Shakeel Butt <shakeel.butt@linux.dev> wrote:
>
> On Fri, Apr 26, 2024 at 05:51:23PM -0700, Yosry Ahmed wrote:
> > On Fri, Apr 26, 2024 at 5:37 PM Shakeel Butt <shakeel.butt@linux.dev> wrote:
> > >
> > > At the moment, the amount of memory allocated for stats related structs
> > > in the mem_cgroup corresponds to the size of enum node_stat_item.
> > > However not all fields in enum node_stat_item has corresponding memcg
> > > stats. So, let's use indirection mechanism similar to the one used for
> > > memcg vmstats management.
> >
> > Just curious, does the indirection table cause any noticeable
> > performance impact? My guess is no, but the update paths are usually
> > very performance sensitive.
> >
> > I guess lkp will shout at us if there are any noticeable regressions.
>
> Yeah and that is the reason I made the indirection table smaller (i.e.
> int8_t) to keep more entries in a single cacheline.
Thanks for pointing this out, probably worth including in the commit log :)
next prev parent reply other threads:[~2024-04-27 1:19 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-27 0:37 [PATCH v2 0/7] memcg: reduce memory consumption by memcg stats Shakeel Butt
2024-04-27 0:37 ` [PATCH v2 1/7] memcg: reduce memory size of mem_cgroup_events_index Shakeel Butt
2024-04-27 0:42 ` Yosry Ahmed
2024-04-27 1:15 ` Shakeel Butt
2024-04-29 15:36 ` Roman Gushchin
2024-04-27 0:37 ` [PATCH v2 2/7] memcg: dynamically allocate lruvec_stats Shakeel Butt
2024-04-27 1:23 ` Yosry Ahmed
2024-04-29 15:50 ` Roman Gushchin
2024-04-29 19:46 ` Shakeel Butt
2024-04-29 21:02 ` Roman Gushchin
2024-04-29 21:59 ` Shakeel Butt
2024-04-27 0:37 ` [PATCH v2 3/7] memcg: reduce memory for the lruvec and memcg stats Shakeel Butt
2024-04-27 0:51 ` Yosry Ahmed
2024-04-27 1:16 ` Shakeel Butt
2024-04-27 1:18 ` Yosry Ahmed [this message]
2024-04-29 16:00 ` Roman Gushchin
2024-04-29 20:00 ` Shakeel Butt
2024-04-29 17:35 ` T.J. Mercier
2024-04-29 20:13 ` Shakeel Butt
2024-04-29 22:23 ` T.J. Mercier
2024-04-27 0:37 ` [PATCH v2 4/7] memcg: cleanup __mod_memcg_lruvec_state Shakeel Butt
2024-04-27 0:53 ` Yosry Ahmed
2024-04-29 15:45 ` Roman Gushchin
2024-04-27 0:37 ` [PATCH v2 5/7] memcg: pr_warn_once for unexpected events and stats Shakeel Butt
2024-04-27 0:58 ` Yosry Ahmed
2024-04-27 1:18 ` Shakeel Butt
2024-04-27 14:22 ` Johannes Weiner
2024-04-29 19:54 ` Shakeel Butt
2024-04-29 16:06 ` Roman Gushchin
2024-04-29 19:56 ` Shakeel Butt
2024-04-27 0:37 ` [PATCH v2 6/7] memcg: use proper type for mod_memcg_state Shakeel Butt
2024-04-27 0:37 ` [PATCH v2 7/7] mm: cleanup WORKINGSET_NODES in workingset Shakeel Butt
2024-04-29 16:07 ` Roman Gushchin
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