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[100.17.19.56]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8a593330a98sm50147126d6.2.2026.04.03.07.13.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Apr 2026 07:13:11 -0700 (PDT) From: Eric Chanudet Date: Fri, 03 Apr 2026 10:08:35 -0400 Subject: [PATCH RFC 1/2] mm/memcontrol: add page-level charge/uncharge functions MIME-Version: 1.0 Message-Id: <20260403-cgroup-dmem-memcg-double-charge-v1-1-c371d155de2a@redhat.com> References: <20260403-cgroup-dmem-memcg-double-charge-v1-0-c371d155de2a@redhat.com> In-Reply-To: <20260403-cgroup-dmem-memcg-double-charge-v1-0-c371d155de2a@redhat.com> To: Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Maarten Lankhorst , Maxime Ripard , Natalie Vock , Tejun Heo , =?utf-8?q?Michal_Koutn=C3=BD?= Cc: cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, "T.J. Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Maxime Ripard , Albert Esteve , Dave Airlie , Eric Chanudet X-Mailer: b4 0.14.2 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: WdMFgVsosS04hnCJaL5mAgkgQxkj-Qc84427S4MWWhQ_1775225592 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 93ADE4000A X-Stat-Signature: 5w5r35wnkgz5pkbum3z83537qgf7xmc7 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775225594-269324 X-HE-Meta: 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 DiaMHvGy 4izN5HpGikrpC9XQnFvDK08F9iYMzg2fXgdg3vpQxSa8HS/r3pKbzZbh+LI1GMXbseB7/rLJAfYBPkzH5ng515uQEVMYLqFFbo4nXXOx7EqwCvtf6I5To4268nzw/+b92lX+lZdVQONckz+NIu2+Z+cEm5/P8FHENCWbZAjn2vorNsH0NZqowmykJvsHfb0hr/GrgJ50+OE1lJd4g7k9zbMHv6MpSj4inOdeYWVdEjeFVzql07lW+1bZMdobsXn+0NLpZRb+O54RfjOmHolVKq19W5eXKIFyPx85/03LVH87Z2hfIHfFXxb+aifm1tK707//Ema4VSPEMXtgd88d0kbjsRvSY6CxY5GLxtRhAB6ClyRMyrFLjTRFNH6KoJClAOej5ayJF8AGnSrcVCxAjEH14Pqnh1Qar+39EWlhAxanZ5auxS79ixyLUnjh5jtxtSpeGHvcvSxb6YcZbm66fe6NWrQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Expose functions to charge/uncharge memcg with a number of pages instead of a folio. Signed-off-by: Eric Chanudet --- include/linux/memcontrol.h | 4 ++++ mm/memcontrol.c | 24 ++++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 70b685a85bf4cd0e830c9c0253e4d48f75957fe4..32f03890f13e06551fc910515eb478597c1235d8 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -642,6 +642,8 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *target, int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp); +int mem_cgroup_try_charge_pages(struct mem_cgroup *memcg, gfp_t gfp_mask, + unsigned int nr_pages); /** * mem_cgroup_charge - Charge a newly allocated folio to a cgroup. * @folio: Folio to charge. @@ -692,6 +694,8 @@ static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios) __mem_cgroup_uncharge_folios(folios); } +void mem_cgroup_uncharge_pages(struct mem_cgroup *memcg, unsigned int nr_pages); + void mem_cgroup_replace_folio(struct folio *old, struct folio *new); void mem_cgroup_migrate(struct folio *old, struct folio *new); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 772bac21d15584ce495cba6ad2eebfa7f693677f..49ed069a2dafd5d26d77e6737dffe7e64ba5118c 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4764,6 +4764,24 @@ int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp) return ret; } +/** + * mem_cgroup_try_charge_pages - charge pages to a memory cgroup + * @memcg: memory cgroup to charge + * @gfp_mask: reclaim mode + * @nr_pages: number of pages to charge + * + * Try to charge @nr_pages to @memcg through try_charge_memcg. + * + * Returns 0 on success, an error code on failure. + */ +int mem_cgroup_try_charge_pages(struct mem_cgroup *memcg, gfp_t gfp_mask, + unsigned int nr_pages) +{ + return try_charge(memcg, gfp_mask, nr_pages); +} +EXPORT_SYMBOL_GPL(mem_cgroup_try_charge_pages); + + /** * mem_cgroup_charge_hugetlb - charge the memcg for a hugetlb folio * @folio: folio being charged @@ -4948,6 +4966,12 @@ void __mem_cgroup_uncharge_folios(struct folio_batch *folios) uncharge_batch(&ug); } +void mem_cgroup_uncharge_pages(struct mem_cgroup *memcg, unsigned int nr_pages) +{ + memcg_uncharge(memcg, nr_pages); +} +EXPORT_SYMBOL_GPL(mem_cgroup_uncharge_pages); + /** * mem_cgroup_replace_folio - Charge a folio's replacement. * @old: Currently circulating folio. -- 2.52.0