From: Roman Gushchin <guro@fb.com>
To: Jann Horn <jannh@google.com>
Cc: Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>,
kernel list <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Shakeel Butt <shakeelb@google.com>,
Suren Baghdasaryan <surenb@google.com>,
Minchan Kim <minchan@kernel.org>
Subject: Re: SLUB: percpu partial object count is highly inaccurate, causing some memory wastage and maybe also worse tail latencies?
Date: Mon, 11 Jan 2021 16:27:20 -0800 [thread overview]
Message-ID: <20210112002720.GA35320@carbon.dhcp.thefacebook.com> (raw)
In-Reply-To: <CAG48ez2Qx5K1Cab-m8BdSibp6wLTip6ro4=-umR7BLsEgjEYzA@mail.gmail.com>
On Tue, Jan 12, 2021 at 12:12:47AM +0100, Jann Horn wrote:
> [This is not something I intend to work on myself. But since I
> stumbled over this issue, I figured I should at least document/report
> it, in case anyone is willing to pick it up.]
Hi, Jann!
Thank you very much for this report!
It should be less of a problem since 5.9, but still on a machine with
many CPUs a non-trivial amount of memory is wasted.
I'll definitely take a look.
Thanks!
next prev parent reply other threads:[~2021-01-12 0:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 23:12 SLUB: percpu partial object count is highly inaccurate, causing some memory wastage and maybe also worse tail latencies? Jann Horn
2021-01-12 0:27 ` Roman Gushchin [this message]
2021-01-12 16:35 ` Christoph Lameter
2021-01-14 9:27 ` Vlastimil Babka
2021-01-18 11:03 ` Michal Hocko
2021-01-18 15:46 ` Christoph Lameter
2021-01-18 16:07 ` Michal Hocko
2021-01-13 19:14 ` Vlastimil Babka
2021-01-13 22:37 ` Jann Horn
2021-01-14 9:04 ` Christoph Lameter
2021-01-21 17:21 ` Vlastimil Babka
2021-01-21 17:21 ` [RFC 1/2] mm, vmscan: add priority field to struct shrink_control Vlastimil Babka
2021-01-21 17:21 ` [RFC 2/2] mm, slub: add shrinker to reclaim cached slabs Vlastimil Babka
2021-01-22 0:48 ` Roman Gushchin
2021-01-26 12:06 ` Vlastimil Babka
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