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[2003:d8:2f22:2e00:6e71:238a:de9f:e396]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a3622b8a3esm22822687f8f.14.2025.05.22.08.59.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 May 2025 08:59:03 -0700 (PDT) Message-ID: <15744682-72ea-472f-9af1-50c3494c0b78@redhat.com> Date: Thu, 22 May 2025 17:59:01 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v0 1/2] migrate: implement migrate_misplaced_folio_batch To: Bharata B Rao , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Jonathan.Cameron@huawei.com, dave.hansen@intel.com, gourry@gourry.net, hannes@cmpxchg.org, 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, dave@stgolabs.net, nifan.cxl@gmail.com, joshua.hahnjy@gmail.com, xuezhengchu@huawei.com, yiannis@zptcorp.com, akpm@linux-foundation.org References: <20250521080238.209678-1-bharata@amd.com> <20250521080238.209678-2-bharata@amd.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 45E1A4000C X-Stat-Signature: bm65fxe996n48o3mkuzdnemhwmb4f9qf X-Rspam-User: X-HE-Tag: 1747929549-762824 X-HE-Meta: U2FsdGVkX184nVjerSBK9ghnHWBwKbPbdNCha2vW9nYUM5jwVXPePbsDWFDIvMdkhQSJr+pOiO2+XdrhFNRmoxrJN+Tjfmy5lIs7jE3Ge8VnWTR8bQ997EPDme4B8MHrOfguaGS4JWQOBfKoB20Zroc1Ld5fr0uxRjTAUCr7MRzc333G4waEDihf3MX/gtsvNdu/gT9hzKrgX/98YMgyw6AoK4GpB90SK9TUZ36AMYZZdM+9SkTNRtkCZQ3dlg3E2Zi/nZ22BanNWsa5dvmcksMeIrVsQPyjxPdiEpxvs8xYdHS5uYhZROP+w68SzWbef0nRRFJHA2DAJJH3nzBG8hyS1AgPtCVVpQw95g0B2AeGkUYp00lupv3RlpEY4sR2rG4vaH4j8BACzU7+3taZ3xyn6BTgIBg5Qos6mpWG7epdvZDIknlhy0wfA4bZfF8Etx8buV0GzSHC7D0ao9nxZVwewU9p2M9XJK9oufUVCDDWwSdr89ADq2zqQRBBDwaZDzohJ2oCqRd1WGQYlZ9vS7BM5Mba1NYsObz/OTUwnzONeEVD605tPc3HI9mbO4WYYduSrRVyLiNLyo8YcxI/PMBU8Tg5Bzl0QJLlizToH7efPgl+3sweK6hMSXZIRawxC1TlJhXugecOCkaW++Z1XTdc880OM21yFkgME/Lc7DqtsX10Oz2gEFkvxzEq/abPZmVEvMhEVnuAMHhhHuRi+2zCitcSO/9+d6WszWu8SWNAGcL8AWCHrGtACt+1dqzDRB7Ah2nSNZ/Er30Hkwjba0WXgszxgXA+O5dBxPRt4WolP2Y83mvUUrprknRu1+sqMDsgtvdaCLVC7qCIsYkSlv9fbSHZijlC2yN7za43DqYUC5ia/Ex0dM60yqDsZArh/QKLqtFTg1hieAx/lkCNxYdkx2RUFwaHJyYj2OYIVzVoZPlO3UONPTZIdLVykR5GsJvtF35tYYPMPj1VviO ya/6eaHm 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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 21.05.25 10:02, Bharata B Rao wrote: > From: Gregory Price > > A common operation in tiering is to migrate multiple pages at once. > The migrate_misplaced_folio function requires one call for each > individual folio. Expose a batch-variant of the same call for use > when doing batch migrations. > > Signed-off-by: Gregory Price > Signed-off-by: Bharata B Rao > --- > include/linux/migrate.h | 6 ++++++ > mm/migrate.c | 31 +++++++++++++++++++++++++++++++ > 2 files changed, 37 insertions(+) > > diff --git a/include/linux/migrate.h b/include/linux/migrate.h > index aaa2114498d6..c9496adcf192 100644 > --- a/include/linux/migrate.h > +++ b/include/linux/migrate.h > @@ -145,6 +145,7 @@ const struct movable_operations *page_movable_ops(struct page *page) > int migrate_misplaced_folio_prepare(struct folio *folio, > struct vm_area_struct *vma, int node); > int migrate_misplaced_folio(struct folio *folio, int node); > +int migrate_misplaced_folio_batch(struct list_head *foliolist, int node); > #else > static inline int migrate_misplaced_folio_prepare(struct folio *folio, > struct vm_area_struct *vma, int node) > @@ -155,6 +156,11 @@ static inline int migrate_misplaced_folio(struct folio *folio, int node) > { > return -EAGAIN; /* can't migrate now */ > } > +static inline int migrate_misplaced_folio_batch(struct list_head *foliolist, > + int node) > +{ > + return -EAGAIN; /* can't migrate now */ > +} > #endif /* CONFIG_NUMA_BALANCING */ > > #ifdef CONFIG_MIGRATION > diff --git a/mm/migrate.c b/mm/migrate.c > index 676d9cfc7059..32cc2eafb037 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -2733,5 +2733,36 @@ int migrate_misplaced_folio(struct folio *folio, int node) > BUG_ON(!list_empty(&migratepages)); > return nr_remaining ? -EAGAIN : 0; > } > + > +/* > + * Batch variant of migrate_misplaced_folio. Attempts to migrate > + * a folio list to the specified destination. > + * > + * Caller is expected to have isolated the folios by calling > + * migrate_misplaced_folio_prepare(), which will result in an > + * elevated reference count on the folio. > + * > + * This function will un-isolate the folios, dereference them, and > + * remove them from the list before returning. > + */ > +int migrate_misplaced_folio_batch(struct list_head *folio_list, int node) "migrate_misplaced_folios" ? :) -- Cheers, David / dhildenb