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 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: List-Subscribe: List-Unsubscribe: On 2025-04-04 at 09:59:49 -0700, Dave Hansen wrote: >On 4/4/25 06:14, Maciej Wieczor-Retman wrote: >> Adjust x86 minimal SLAB alignment to match KASAN granularity size. In >> tag-based mode the size changes to 16 bytes so the value needs to be 16. > >I feel like we need a _bit_ of a discussion of the impact here. We are, >after all, trying to get this feature into shape so that it can be used >more widely outside of just debugging environments. > >What's the impact of this in a production environment? I tried booting a fedora 41 on a Sierra Forest system with KASAN disabled (disabled only the reports so the 8 byte alignment doesn't cause a wall of debug information). Did so for both 8 byte alignment (default) and 16 byte alignment (added by the series). The differences looked mostly like noise, sometimes the higher alignment would use up a little bit less memory, sometimes a little bit more. I looked at all values in "cat /proc/meminfo". Is there some slab/slub benchmark for the kernel that would make sense to checkout here? -- Kind regards Maciej Wieczór-Retman