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Tue, 29 Sep 2026 22:08:11 +0000 Received: from offworld (unknown [76.167.199.67]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dave@stgolabs.net) by pdx1-sub0-mail-a214.dreamhost.com (Postfix) with ESMTPSA id 4hvXP11m3gz4D; Tue, 29 Sep 2026 15:08:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1790719686; bh=i/MjidhiyZvlwnI8HPoAfUzgBLm2B3srI3Zh+AVUip4=; h=Date:From:To:Cc:Subject:Content-Type; b=HWOBl2RC1sncyg+qW4OI0NL5BUYwZNX3YyPzt86HpjNrbY3ab4XpchI2ADRBJK2he 3TC8Hqtei1jo31E3ZN3/gjb3OWLGb7tHSIBPvmVTjiqLZddMLPZlHuMxq8IVHzlREY 1vRrE5/YQUQlJq3ICRXCoCPBsj85VN/Q2neTO28aotqD7HS68jTarfdfIbxB0+Q3Se +figL3yCghu0/dt++5c41MkAYj/ZCXquKMcUwhreo+Ll3Z1UWEXzR31bYRi77Ko6Js KI5+Js380yfPKq8rQCbzLR+KoYoLLgwqrAOgvia94gfDbRS6PG9eHjPPLsh9phFHQ4 tH/BM38SZuGNw== Date: Tue, 29 Sep 2026 15:08:00 -0700 From: Davidlohr Bueso To: Bharata B Rao Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jonathan.Cameron@huawei.com, dave.hansen@intel.com, gourry@gourry.net, mgorman@techsingularity.net, mingo@redhat.com, peterz@infradead.org, raghavendra.kt@amd.com, riel@surriel.com, rientjes@google.com, sj@kernel.org, weixugc@google.com, willy@infradead.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, nifan.cxl@gmail.com, xuezhengchu@huawei.com, yiannis@zptcorp.com, akpm@linux-foundation.org, david@kernel.org, byungchul@sk.com, kinseyho@google.com, joshua.hahnjy@gmail.com, yuanchu@google.com, balbirs@nvidia.com, alok.rathore@samsung.com, shivankg@amd.com, donettom@linux.ibm.com Subject: Re: [PATCH v8 2/8] mm: migrate: Add promote_misplaced_memcg_folios() Message-ID: <20260929220800.ekoqcpxkyfgbe3s4@offworld> References: <20260728054356.291998-1-bharata@amd.com> <20260728054356.291998-3-bharata@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20260728054356.291998-3-bharata@amd.com> User-Agent: NeoMutt/20220429 X-Rspamd-Server: rspam06 X-Stat-Signature: 4h91m18iuon5n7e7xsi7i5d4okxi8fdj X-Rspam-User: X-Rspamd-Queue-Id: 05AB64000C X-HE-Tag: 1790719692-377908 X-HE-Meta: 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 LWPIxQtu 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 28 Jul 2026, Bharata B Rao wrote: >From: Gregory Price > >Tiered memory systems often require migrating multiple folios at once. >Currently, migrate_misplaced_folio() handles only one folio per call, >which is inefficient for batch operations. This patch introduces >promote_misplaced_memcg_folios(), a batch variant that leverages >migrate_pages() internally for improved performance. > >The caller must isolate folios beforehand using >migrate_misplaced_folio_prepare(). Additionally all the folios in the >isolated list must belong to the same memcg. On return, the folio list >will be empty regardless of success or failure. > >This function will be used by pghot kmigrated thread. > >Signed-off-by: Gregory Price >[Rewrote commit description, memcg awareness] >Signed-off-by: Bharata B Rao Reviewed-by: Davidlohr Bueso