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Date: Thu, 14 Jan 2021 10:27:40 +0100 From: Vlastimil Babka <vbabka@...e.cz> To: Christoph Lameter <cl@...ux.com>, Jann Horn <jannh@...gle.com> Cc: Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, Linux-MM <linux-mm@...ck.org>, kernel list <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Roman Gushchin <guro@...com>, Johannes Weiner <hannes@...xchg.org>, Shakeel Butt <shakeelb@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, Minchan Kim <minchan@...nel.org>, Michal Hocko <mhocko@...nel.org> Subject: SLUB: percpu partial object count is highly inaccurate, causing some memory wastage and maybe also worse tail latencies? On 1/12/21 5:35 PM, Christoph Lameter wrote: > On Tue, 12 Jan 2021, 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.] > > Well yeah all true. There is however a slabinfo tool that has an -s option > to shrink all slabs. > > slabinfo -s > > So you could put that somewhere that executes if the system is > idle or put it into cron or so. Hm this would be similar to recommending a periodical echo > drop_caches operation. We actually discourage from that (and yeah, some tools do that, and we now report those in dmesg). I believe the kernel should respond to memory pressure and not OOM prematurely by itself, including SLUB.
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