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Wed, 11 Feb 2026 20:51:31 -0800 (PST) Received: from jpkobryn-fedora-PF5CFKNC.lan ([73.222.117.172]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2ba9daa6151sm2878699eec.0.2026.02.11.20.51.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Feb 2026 20:51:30 -0800 (PST) From: JP Kobryn To: linux-mm@kvack.org Cc: apopple@nvidia.com, akpm@linux-foundation.org, axelrasmussen@google.com, byungchul@sk.com, cgroups@vger.kernel.org, david@kernel.org, eperezma@redhat.com, gourry@gourry.net, jasowang@redhat.com, hannes@cmpxchg.org, joshua.hahnjy@gmail.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, matthew.brost@intel.com, mst@redhat.com, mhocko@suse.com, rppt@kernel.org, muchun.song@linux.dev, zhengqi.arch@bytedance.com, rakie.kim@sk.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, surenb@google.com, virtualization@lists.linux.dev, vbabka@suse.cz, weixugc@google.com, xuanzhuo@linux.alibaba.com, ying.huang@linux.alibaba.com, yuanchu@google.com, ziy@nvidia.com, kernel-team@meta.com Subject: [PATCH 1/2] mm/mempolicy: track page allocations per mempolicy Date: Wed, 11 Feb 2026 20:51:08 -0800 Message-ID: <20260212045109.255391-2-inwardvessel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260212045109.255391-1-inwardvessel@gmail.com> References: <20260212045109.255391-1-inwardvessel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Stat-Signature: 4g7s9uxip3bd1y7txqdshmxsfngj1wi8 X-Rspamd-Queue-Id: 500C640006 X-Rspam-User: X-HE-Tag: 1770871892-860577 X-HE-Meta: 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 sW5PtJIM 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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: It would be useful to see a breakdown of allocations to understand which NUMA policies are driving them. For example, when investigating memory pressure, having policy-specific counts could show that allocations were bound to the affected node (via MPOL_BIND). Add per-policy page allocation counters as new node stat items. These counters can provide correlation between a mempolicy and pressure on a given node. Signed-off-by: JP Kobryn Suggested-by: Johannes Weiner --- include/linux/mmzone.h | 9 +++++++++ mm/mempolicy.c | 30 ++++++++++++++++++++++++++++-- mm/vmstat.c | 9 +++++++++ 3 files changed, 46 insertions(+), 2 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index fc5d6c88d2f0..762609d5f0af 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -255,6 +255,15 @@ enum node_stat_item { PGDEMOTE_DIRECT, PGDEMOTE_KHUGEPAGED, PGDEMOTE_PROACTIVE, +#ifdef CONFIG_NUMA + PGALLOC_MPOL_DEFAULT, + PGALLOC_MPOL_PREFERRED, + PGALLOC_MPOL_BIND, + PGALLOC_MPOL_INTERLEAVE, + PGALLOC_MPOL_LOCAL, + PGALLOC_MPOL_PREFERRED_MANY, + PGALLOC_MPOL_WEIGHTED_INTERLEAVE, +#endif #ifdef CONFIG_HUGETLB_PAGE NR_HUGETLB, #endif diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 68a98ba57882..3c64784af761 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -217,6 +217,21 @@ static void reduce_interleave_weights(unsigned int *bw, u8 *new_iw) new_iw[nid] /= iw_gcd; } +#define CHECK_MPOL_NODE_STAT_OFFSET(mpol) \ + BUILD_BUG_ON(PGALLOC_##mpol - mpol != PGALLOC_MPOL_DEFAULT) + +static enum node_stat_item mpol_node_stat(unsigned short mode) +{ + CHECK_MPOL_NODE_STAT_OFFSET(MPOL_PREFERRED); + CHECK_MPOL_NODE_STAT_OFFSET(MPOL_BIND); + CHECK_MPOL_NODE_STAT_OFFSET(MPOL_INTERLEAVE); + CHECK_MPOL_NODE_STAT_OFFSET(MPOL_LOCAL); + CHECK_MPOL_NODE_STAT_OFFSET(MPOL_PREFERRED_MANY); + CHECK_MPOL_NODE_STAT_OFFSET(MPOL_WEIGHTED_INTERLEAVE); + + return PGALLOC_MPOL_DEFAULT + mode; +} + int mempolicy_set_node_perf(unsigned int node, struct access_coordinate *coords) { struct weighted_interleave_state *new_wi_state, *old_wi_state = NULL; @@ -2446,8 +2461,14 @@ static struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order, nodemask = policy_nodemask(gfp, pol, ilx, &nid); - if (pol->mode == MPOL_PREFERRED_MANY) - return alloc_pages_preferred_many(gfp, order, nid, nodemask); + if (pol->mode == MPOL_PREFERRED_MANY) { + page = alloc_pages_preferred_many(gfp, order, nid, nodemask); + if (page) + __mod_node_page_state(page_pgdat(page), + mpol_node_stat(MPOL_PREFERRED_MANY), 1 << order); + + return page; + } if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && /* filter "hugepage" allocation, unless from alloc_pages() */ @@ -2472,6 +2493,9 @@ static struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order, page = __alloc_frozen_pages_noprof( gfp | __GFP_THISNODE | __GFP_NORETRY, order, nid, NULL); + if (page) + __mod_node_page_state(page_pgdat(page), + mpol_node_stat(pol->mode), 1 << order); if (page || !(gfp & __GFP_DIRECT_RECLAIM)) return page; /* @@ -2484,6 +2508,8 @@ static struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order, } page = __alloc_frozen_pages_noprof(gfp, order, nid, nodemask); + if (page) + __mod_node_page_state(page_pgdat(page), mpol_node_stat(pol->mode), 1 << order); if (unlikely(pol->mode == MPOL_INTERLEAVE || pol->mode == MPOL_WEIGHTED_INTERLEAVE) && page) { diff --git a/mm/vmstat.c b/mm/vmstat.c index 65de88cdf40e..74e0ddde1e93 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1291,6 +1291,15 @@ const char * const vmstat_text[] = { [I(PGDEMOTE_DIRECT)] = "pgdemote_direct", [I(PGDEMOTE_KHUGEPAGED)] = "pgdemote_khugepaged", [I(PGDEMOTE_PROACTIVE)] = "pgdemote_proactive", +#ifdef CONFIG_NUMA + [I(PGALLOC_MPOL_DEFAULT)] = "pgalloc_mpol_default", + [I(PGALLOC_MPOL_PREFERRED)] = "pgalloc_mpol_preferred", + [I(PGALLOC_MPOL_BIND)] = "pgalloc_mpol_bind", + [I(PGALLOC_MPOL_INTERLEAVE)] = "pgalloc_mpol_interleave", + [I(PGALLOC_MPOL_LOCAL)] = "pgalloc_mpol_local", + [I(PGALLOC_MPOL_PREFERRED_MANY)] = "pgalloc_mpol_preferred_many", + [I(PGALLOC_MPOL_WEIGHTED_INTERLEAVE)] = "pgalloc_mpol_weighted_interleave", +#endif #ifdef CONFIG_HUGETLB_PAGE [I(NR_HUGETLB)] = "nr_hugetlb", #endif -- 2.47.3