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b=Xro6Eb+rUE86RnbMJWxBwPCOXOCMH7r4XuDwCdsV1tSubc3JLvla0Aph2hDvOG2XV M16+614h4x+Rn93ddAavC52RQAbBuiruOpohnIw0hBH//qTpW896P6JOsbKETHNn4O xhwGZDPoS4n+kJdTT3m4P43Jj3SVT6u7xxyczirbqGY4CqjURmAuUBwTb7VabhPR9f xjHxXlmc9c93vyEbj5LYWhCubJRoMePbGaqsO2ZNmkmXAptpzxBLw/dhznTFRivcxN kDEqlZksN/p0gkc8mgeFCKeekhTd/owc8JmoiQQFH4rQmnmGymKTBe1fhyrwEYDUZc nCMjFuz/H3WIg== From: SJ Park To: Jiahui Zhang Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Honggyu Kim Subject: Re: [PATCH v2] mm/damon/ops-common: prevent migration fallback to non-target nodes Date: Tue, 14 Jul 2026 07:19:26 -0700 Message-ID: <20260714141927.100207-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A798C40009 X-Stat-Signature: tbepf4da3rbmkd6kpo36oqxux9u4rsrh X-Rspam-User: X-HE-Tag: 1784038776-248902 X-HE-Meta: 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 gG2rCEaK JfTdnpGg4RlQSXZH8LAQGVEOp91OvEey+5iEAsxehgXPrFzitmj8tW62hdQ/8b/ofur0vCtBy3HmW3L219+zQurYFBH8n6VnBBNZ6nSgdtOdttEy1o27AhozTJbZPtyDEmiOjQNtp/MI00zbzNoSm4bFRVXfn3cQEvdE3oGoeaNByzESygwrpv+Bf8fG95iAQEaA9yX5tctfssXGBk2nm6HG5nuz3t5iBEsKeYKIicIvXvWdvbNzML6MgAVd4YlX08oCF418Kc6Pu+9Ut251QHgnCOQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 14 Jul 2026 03:38:17 -0700 Jiahui Zhang wrote: > DAMOS_MIGRATE_{HOT,COLD} passes a target NUMA node to migrate_pages(). > But alloc_migration_target() only treats mtc->nid as a preferred node > unless __GFP_THISNODE is set. Hence target allocation can fall back > to another node, and migrate_pages() can report success without placing > the folio on the requested target node. [...] All make sense to me. Thank you for kindly revisioning with the clarification of the motivation, Jiahui! > Signed-off-by: Jiahui Zhang Reviewed-by: SJ Park This patch is applied to damon/next [1] tree. If this patch is not added to mm.git in short term (~1 week?), I will ask mm.git maintainer (Andrew Morton) to pick this. So, no action from your side is needed for now. If it seems I also forgot doing that or you cannot wait for my action, please feel free to directly ask that to Andrew. [1] https://origin.kernel.org/doc/html/latest/mm/damon/maintainer-profile.html#scm-trees Thanks, SJ [...]