Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753261Ab2KFTzr (ORCPT ); Tue, 6 Nov 2012 14:55:47 -0500 Received: from e23smtp07.au.ibm.com ([202.81.31.140]:58902 "EHLO e23smtp07.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751546Ab2KFTzp (ORCPT ); Tue, 6 Nov 2012 14:55:45 -0500 From: "Srivatsa S. Bhat" Subject: [RFC PATCH 8/8] mm: Print memory region statistics to understand the buddy allocator behavior To: akpm@linux-foundation.org, mgorman@suse.de, mjg59@srcf.ucam.org, paulmck@linux.vnet.ibm.com, dave@linux.vnet.ibm.com, maxime.coquelin@stericsson.com, loic.pallardy@stericsson.com, arjan@linux.intel.com, kmpark@infradead.org, kamezawa.hiroyu@jp.fujitsu.com, lenb@kernel.org, rjw@sisk.pl Cc: gargankita@gmail.com, amit.kachhap@linaro.org, svaidy@linux.vnet.ibm.com, thomas.abraham@linaro.org, santosh.shilimkar@ti.com, srivatsa.bhat@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Wed, 07 Nov 2012 01:24:32 +0530 Message-ID: <20121106195428.6941.92699.stgit@srivatsabhat.in.ibm.com> In-Reply-To: <20121106195026.6941.24662.stgit@srivatsabhat.in.ibm.com> References: <20121106195026.6941.24662.stgit@srivatsabhat.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit x-cbid: 12110619-0260-0000-0000-0000021B8E57 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3559 Lines: 108 In order to observe the behavior of the region-aware buddy allocator, modify vmstat.c to also print memory region related statistics. In particular, enable memory region-related info in /proc/zoneinfo and /proc/buddyinfo, since they would help us to atleast (roughly) see how the new buddy allocator is performing. For now, the region statistics correspond to the zone memory regions and not the (absolute) node memory regions, and some of the statistics (especially the no. of present pages) might not be very accurate. But since we account for and print the free page statistics for every zone memory region accurately, we should be able to observe the new page allocator behavior to a reasonable degree of accuracy. Signed-off-by: Srivatsa S. Bhat --- mm/vmstat.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 53 insertions(+), 4 deletions(-) diff --git a/mm/vmstat.c b/mm/vmstat.c index 8183331..cbcd373 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -812,11 +812,31 @@ const char * const vmstat_text[] = { static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { - int order; + int i, order, t; + struct free_area *area; - seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); - for (order = 0; order < MAX_ORDER; ++order) - seq_printf(m, "%6lu ", zone->free_area[order].nr_free); + seq_printf(m, "Node %d, zone %8s \n", pgdat->node_id, zone->name); + + for (i = 0; i < zone->nr_zone_regions; i++) { + + seq_printf(m, "\t\t Region %d ", i); + + for (order = 0; order < MAX_ORDER; ++order) { + unsigned long nr_free = 0; + + area = &zone->free_area[order]; + + for (t = 0; t < MIGRATE_TYPES; t++) { + if (t == MIGRATE_ISOLATE || + t == MIGRATE_RESERVE) + continue; + nr_free += + area->free_list[t].mr_list[i].nr_free; + } + seq_printf(m, "%6lu ", nr_free); + } + seq_putc(m, '\n'); + } seq_putc(m, '\n'); } @@ -984,6 +1004,8 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { int i; + unsigned long zone_nr_free = 0; + seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); seq_printf(m, "\n pages free %lu" @@ -1001,6 +1023,33 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, zone->spanned_pages, zone->present_pages); + for (i = 0; i < zone->nr_zone_regions; i++) { + int order, t; + unsigned long nr_free = 0; + struct free_area *area = zone->free_area; + + for_each_migratetype_order(order, t) { + if (t == MIGRATE_ISOLATE || t == MIGRATE_RESERVE) + continue; + nr_free += + area[order].free_list[t].mr_list[i].nr_free + * (1UL << order); + } + seq_printf(m, "\n\nZone mem region %d", i); + seq_printf(m, + "\n pages spanned %lu" + "\n present %lu" + "\n free %lu", + zone->zone_mem_region[i].spanned_pages, + zone->zone_mem_region[i].present_pages, + nr_free); + } + + for (i = 0; i < MAX_ORDER; i++) + zone_nr_free += zone->free_area[i].nr_free * (1UL << i); + + seq_printf(m, "\nZone pages nr_free %lu\n", zone_nr_free); + for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) seq_printf(m, "\n %-12s %lu", vmstat_text[i], zone_page_state(zone, i)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/