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Thu, 25 May 2023 12:11:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id mktqNHRQb2ScLQAAMHmgww (envelope-from ); Thu, 25 May 2023 12:11:32 +0000 Date: Thu, 25 May 2023 14:05:25 +0200 From: David Sterba To: Vlastimil Babka Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>, David Sterba , Christoph Lameter , David Rientjes , Pekka Enberg , Andrew Morton , Joonsoo Kim , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Roman Gushchin Subject: Re: [PATCH] mm/slab: add new flag SLAB_NO_MERGE to avoid merging per slab Message-ID: <20230525120524.GH30909@suse.cz> Reply-To: dsterba@suse.cz References: <20230524101748.30714-1-dsterba@suse.com> <70763661-b2a2-4bf2-f589-e0d71083f1bd@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <70763661-b2a2-4bf2-f589-e0d71083f1bd@suse.cz> User-Agent: Mutt/1.5.23.1-rc1 (2014-03-12) X-Rspamd-Queue-Id: 9B56FC001B X-Rspam-User: X-Stat-Signature: 6cykg1uzp5mmqozgufiqi4i8n1gq5m3n X-Rspamd-Server: rspam01 X-HE-Tag: 1685016694-410227 X-HE-Meta: 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 9qgorQhr G/WrCCFgktEGav70tSWnnc6abi62Y2eGPh3j0XyFzdQIQd3Vtd9vPGqLo9Qx4l2DLT4BSZYPvJ895bqVLSB6vwDDFzFi4nGLDMZdUUjhQ2u94/H/ipra5sRQXnh6cyJQq7UxDqHQT2mimZENyMdEgrL3w21mhOinj3/82O3Ygw/j/mXIkZt2GAC9nzKRHnIQVJWNV0FoKBL/CX7gLip9UhET7KfMvOy76cq/66FQIioza8nG503ThZZAj6X+TI9ypLslZPV/UEN2XdCbNcYcr4soRfeTDTY4O3BL8jXg9bPixtcfEPyvKMhwg9nknUtXERQwPACp/R3AIVsJWYfj9EenjB6LC0yOD17tNNqlRNlgyu7/p1CWh71Gu/bmpL+/BAJ20OJe4k3p4qUN5SumxT9rtushyxEEa5st6BeZnffjnYYRZyi6fJRAzHKUn8NiqvWPdC0Ca9sfPCbq9laEMLFdnwA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, May 24, 2023 at 03:53:11PM +0200, Vlastimil Babka wrote: > On 5/24/23 14:56, Hyeonggon Yoo wrote: > > On Wed, May 24, 2023 at 12:17:48PM +0200, David Sterba wrote: > > work for your use case? (there are some boot-time slub_debug options described in > > Documentation/mm/slub.rst) > > Yeah, it supports globbing so it would be e.g. slub_debug=N,btrfs* > That would deal with the "too coarse" aspect slab_nomerge. As for "need to > be enabled on all testing hosts", is it more convenient to deploy a debug > kernel build on them? Might be because you do that for other reasons > already? Just want to clarify. Yeah, agreed. > BTW this was proposed as RFC few months ago but not pursued: > https://lore.kernel.org/all/167396280045.539803.7540459812377220500.stgit@firesoul/ > > I have no big objections, just wouldn't like to see its usage proliferate > unconditionally into non-debug builds. It would be fine for me to make it conditionally available, e.g. depending on SLUB_DEBUG.