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Date: Fri, 29 Apr 2022 11:56:31 +0200 From: Vlastimil Babka <vbabka@...e.cz> To: Peter Collingbourne <pcc@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>, Hyeonggon Yoo <42.hyeyoo@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, Catalin Marinas <catalin.marinas@....com> Cc: Linux ARM <linux-arm-kernel@...ts.infradead.org>, Linux Memory Management List <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, penberg@...nel.org, roman.gushchin@...ux.dev, iamjoonsoo.kim@....com, rientjes@...gle.com, Herbert Xu <herbert@...dor.apana.org.au>, Andrey Ryabinin <ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev <kasan-dev@...glegroups.com>, Eric Biederman <ebiederm@...ssion.com>, Kees Cook <keescook@...omium.org> Subject: Re: [PATCH v5 2/2] mm: make minimum slab alignment a runtime property On 4/27/22 21:58, Peter Collingbourne wrote: > When CONFIG_KASAN_HW_TAGS is enabled we currently increase the minimum > slab alignment to 16. This happens even if MTE is not supported in > hardware or disabled via kasan=off, which creates an unnecessary > memory overhead in those cases. Eliminate this overhead by making > the minimum slab alignment a runtime property and only aligning to > 16 if KASAN is enabled at runtime. > > On a DragonBoard 845c (non-MTE hardware) with a kernel built with > CONFIG_KASAN_HW_TAGS, waiting for quiescence after a full Android > boot I see the following Slab measurements in /proc/meminfo (median > of 3 reboots): > > Before: 169020 kB > After: 167304 kB > > Link: https://linux-review.googlesource.com/id/I752e725179b43b144153f4b6f584ceb646473ead > Signed-off-by: Peter Collingbourne <pcc@...gle.com> > Reviewed-by: Andrey Konovalov <andreyknvl@...il.com> > Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com> > Tested-by: Hyeonggon Yoo <42.hyeyoo@...il.com> > Acked-by: David Rientjes <rientjes@...gle.com> > Reviewed-by: Catalin Marinas <catalin.marinas@....com> Acked-by: Vlastimil Babka <vbabka@...e.cz> Andrew's fixup LGTM too.
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