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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 6912C100006 X-Stat-Signature: u5rdta1or7qbq5nc45bdhxsjfory69aq X-Rspam-User: X-HE-Tag: 1745871828-837033 X-HE-Meta: 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 az3O8D+C 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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 28.04.25 21:57, Suren Baghdasaryan wrote: > On Mon, Apr 28, 2025 at 12:37 PM Lorenzo Stoakes > wrote: >> >> On Mon, Apr 28, 2025 at 07:23:18PM +0200, David Hildenbrand wrote: >>> On 28.04.25 18:24, Peter Xu wrote: >>>> On Mon, Apr 28, 2025 at 06:16:21PM +0200, David Hildenbrand wrote: >>>>>> Probably due to what config you have. E.g., when I'm looking mine it's >>>>>> much bigger and already consuming 256B, but it's because I enabled more >>>>>> things (userfaultfd, lockdep, etc.). >>>>> >>>>> Note that I enabled everything that you would expect on a production system >>>>> (incld. userfaultfd, mempolicy, per-vma locks), so I didn't enable lockep. >>>> >>>> I still doubt whether you at least enabled userfaultfd, e.g., your previous >>>> paste has: >>>> >>>> struct vm_userfaultfd_ctx vm_userfaultfd_ctx; /* 176 0 */ >>>> >>>> Not something that matters.. but just in case you didn't use the expected >>>> config file you wanted to use.. >>> >>> You're absolutely right. I only briefly rechecked for this purpose here on >>> my notebook, and only looked for the existence of members, not expecting >>> that we have confusing stuff like vm_userfaultfd_ctx. >>> >>> I checked again and the size stays at 192 with allyesconfig and then >>> disabling debug options. >> >> I think a reasonable case is everything on, except CONFIG_DEBUG_LOCK_ALLOC and I >> don't care about nommu. > > I think it's safe to assume that production systems would disable > lockdep due to the performance overhead. At least that's what we do on > Android - enable it on development branches but disable in production. Right, and "struct lockdep_map" is ... significantly larger than 8 bytes. With that enabled, one is already paying for extra VMA space ... -- Cheers, David / dhildenb