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b=B1l8ZDUlA5+/9mCrhmuKKAVY6tSTAg+tNf2blzd4kHX5GlmtGVVOBpxAqH3PAlvKT PlrTUA4klUPUsjpOLqbkrVtPf39K0TDm6BYn4s8J/9PwxTHCXn7muXIaMvsUsyr/k9 LW86+H/V4iut3QPPRxRe27QtUIVkYlF9o1YE2IYE= Date: Tue, 10 Sep 2024 20:42:02 -0700 From: Andrew Morton To: Jens Axboe Cc: Yu Zhao , Linux-MM , Johannes Weiner , Muchun Song Subject: Re: Hugepage program taking forever to exit Message-Id: <20240910204202.6235f8023bff8303aa2463b7@linux-foundation.org> In-Reply-To: <9a924b36-aea7-4492-912a-a7ab4f2cbb96@kernel.dk> References: <02ffa542-ce49-4755-9d2b-29841f9973e0@kernel.dk> <9a924b36-aea7-4492-912a-a7ab4f2cbb96@kernel.dk> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 2E73540006 X-Stat-Signature: wjookbi8jcyysfub45k8haw6s4c53hc8 X-Rspam-User: X-HE-Tag: 1726026124-930875 X-HE-Meta: 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 9q7wIudR yOoT0aG6+P85Z2QUTuHUjO4Gi2OicN9013L8LIyeRaMtQxvWZPw07ZVC46APLv2ljs0x1L6TJpEfhuN/McWwq9T+IcY743DUNjxm6/iRibUnZQ0iT8btH0t8veEzYZbmQ2tPddl1NVlTi4m0GhFk2OdNycwmFbSD9oM6AFv9u6QfFEabWXMORjyx43lyUVoMjJ1rWwZXXbG6bHEr7hbBsiShKBffDfKo9Fdoe+wt0AdNBdIzYdjEUXDP/jWnN9dRDGJT9ARI+QgRxqPk= 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 Tue, 10 Sep 2024 17:08:30 -0600 Jens Axboe wrote: > > Fixes are in git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-stable > > > > c2a967f6ab0e mm/hugetlb_vmemmap: don't synchronize_rcu() without HVO > > c0f398c3b2cf mm/hugetlb_vmemmap: batch HVO work when demoting > > > > Additional improvements from mm-stable that may or may not help your test case: > > > > e98337d11bbd mm/contig_alloc: support __GFP_COMP > > 463586e9ff39 mm/cma: add cma_{alloc,free}_folio() > > cf54f310d0d3 mm/hugetlb: use __GFP_COMP for gigantic folios > > I didn't pick patches, just pulled all of mm-stable - yep that fixes it > for me, no longer spending 60+% of the runtime during exit. I trust > these are heading to stable? None of these are tagged for -stable backporting. We can later request a backport without the cc:stable tag, although narrowing down the required patches would be good.