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Mon, 15 Jan 2024 01:34:54 -0800 (PST) Received: from VERNHAO-MC1.tencent.com ([43.132.98.40]) by smtp.gmail.com with ESMTPSA id b12-20020aa78ecc000000b006db105027basm7200686pfr.50.2024.01.15.01.34.52 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 15 Jan 2024 01:34:54 -0800 (PST) From: Vern Hao X-Google-Original-From: Vern Hao To: mgorman@techsingularity.net Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, haoxing990@gmail.com, Xin Hao Subject: [PATCH RFC v1 2/2] mm, pcp: add more detail info about high order page count Date: Mon, 15 Jan 2024 17:34:36 +0800 Message-ID: <20240115093437.87814-3-vernhao@tencent.com> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20240115093437.87814-1-vernhao@tencent.com> References: <20240115093437.87814-1-vernhao@tencent.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Xin Hao With this patch, we can see the distribution of pages of different orders on each cpu, just like below. #cat /proc/zoneinfo .... cpu: 2 total_count: 14286 order0 : 1260 order1 : 13 order2 : 42 order3 : 4 order4 : 0 order5 : 0 order6 : 0 order7 : 0 order8 : 0 order9 : 25 order10: 0 order11: 0 order12: 0 high: 14541 batch: 63 Signed-off-by: Xin Hao --- include/linux/mmzone.h | 1 + mm/page_alloc.c | 4 ++++ mm/vmstat.c | 18 ++++++++++++------ 3 files changed, 17 insertions(+), 6 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 883168776fea..55d25b4f51e5 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -684,6 +684,7 @@ enum zone_watermarks { struct per_cpu_pages { spinlock_t lock; /* Protects lists field */ int total_count; /* total number of pages in the list */ + int count[NR_PCP_LISTS]; /* per-order page counts */ int high; /* high watermark, emptying needed */ int high_min; /* min high watermark */ int high_max; /* max high watermark */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4e91e429b8d1..7ec2dc5c5ea5 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1228,6 +1228,7 @@ static void free_pcppages_bulk(struct zone *zone, int= count, list_del(&page->pcp_list); count -=3D nr_pages; pcp->total_count -=3D nr_pages; + pcp->count[order] -=3D 1; =20 /* MIGRATE_ISOLATE page should not go to pcplists */ VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); @@ -2478,6 +2479,7 @@ static void free_unref_page_commit(struct zone *zone,= struct per_cpu_pages *pcp, pindex =3D order_to_pindex(migratetype, order); list_add(&page->pcp_list, &pcp->lists[pindex]); pcp->total_count +=3D 1 << order; + pcp->count[order] +=3D 1; =20 batch =3D READ_ONCE(pcp->batch); /* @@ -2858,6 +2860,7 @@ struct page *__rmqueue_pcplist(struct zone *zone, uns= igned int order, migratetype, alloc_flags); =20 pcp->total_count +=3D alloced << order; + pcp->count[order] +=3D alloced; if (unlikely(list_empty(list))) return NULL; } @@ -2865,6 +2868,7 @@ struct page *__rmqueue_pcplist(struct zone *zone, uns= igned int order, page =3D list_first_entry(list, struct page, pcp_list); list_del(&page->pcp_list); pcp->total_count -=3D 1 << order; + pcp->count[order] -=3D 1; } while (check_new_pages(page, order)); =20 return page; diff --git a/mm/vmstat.c b/mm/vmstat.c index c1e8096ff0a6..e04300ec450f 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1735,19 +1735,25 @@ static void zoneinfo_show_print(struct seq_file *m,= pg_data_t *pgdat, =20 seq_printf(m, "\n pagesets"); for_each_online_cpu(i) { + int j; struct per_cpu_pages *pcp; struct per_cpu_zonestat __maybe_unused *pzstats; =20 pcp =3D per_cpu_ptr(zone->per_cpu_pageset, i); seq_printf(m, "\n cpu: %i" - "\n count: %i" - "\n high: %i" - "\n batch: %i", + "\n total_count: %i", i, - pcp->total_count, - pcp->high, - pcp->batch); + pcp->total_count); + for (j =3D 0; j < NR_PCP_LISTS; j++) + seq_printf(m, + "\n order%-2i: %-3i", + j, pcp->count[j]); + seq_printf(m, + "\n high: %i" + "\n batch: %i", + pcp->high, + pcp->batch); #ifdef CONFIG_SMP pzstats =3D per_cpu_ptr(zone->per_cpu_zonestats, i); seq_printf(m, "\n vm stats threshold: %d", --=20 2.31.1