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Thu, 15 Oct 2026 08:55:25 -0400 (EDT) Date: Thu, 15 Oct 2026 13:55:24 +0100 From: Kiryl Shutsemau To: "Vlastimil Babka (SUSE)" Cc: Johannes Weiner , Andrew Morton , David Hildenbrand , Harry Yoo , Usama Arif , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Zi Yan , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH v3] mm: page_alloc: make defrag_mode retries follow the promoted order Message-ID: References: <20261009125503.126202-1-kas@kernel.org> <15a9e03e-c748-4e51-b8cc-583a3610c897@kernel.org> <20261012192834.6934ef85444dee4a60d6d876@linux-foundation.org> <20261014202936.GC371161@cmpxchg.org> <78238103-3a7f-432c-b1df-bd14d7cf4bb1@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <78238103-3a7f-432c-b1df-bd14d7cf4bb1@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8023E10000C X-Stat-Signature: ejofz75qs8q5ai1xhimj7w99afdmgifp X-HE-Tag: 1792068932-915037 X-HE-Meta: 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 pEX2EnyB WDfJTjT4S0lVSU/jmVvyXfSIRNNHJiO35qY4PrVCcrtSOt836e8T8CMwpMs5Sw/TidIRS0xd0rsbbhEXylKx7eWikIdUVW4+TRDgLrxbeVGgcS6dnr83CirSijtUxP2OroJzNzUmhcTeoJYLKHbv6WZFilYFU9eGL2b4FHaIRZ/VHANxAfLg2QPey5W7N+Mk8RoyQinoH3CeZQ81XCjTHV0rP0/ANSd30AcQ5KAjZtEEOh+E8ANNNNIR3kApE9ZdIPjMvUjIu4S00266gjhixyanE4YDdZ/Rox/qnQxta3ZcRKNUN7jnuKQADTO0Sxnz5yrt0DUXkDrPJRM0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Oct 15, 2026 at 09:16:36AM +0200, Vlastimil Babka (SUSE) wrote: > > And agree 7.4-rc1 with CC stable is fine. Sadly, not sure if anyone > > but Meta is using the feature right now. > > I thought it was there for a long time but it was only added in 2025 :) At > least the enterprise world is slow to adopt things, AFAICS. I was thinking to propose a patch after merge window to make defrag_mode default. Do you think it is too early? I don't think it is ever going to be truly stabilized without wider exposure. We also discussed with Johannes to make a stricter (defrag_mode=2?) mode that will not give up on fragmentation ever, but OOM instead. -- Kiryl Shutsemau / Kirill A. Shutemov