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Bhat" Subject: [RFC PATCH v3 10/35] mm: Use the correct migratetype during buddy merging To: akpm@linux-foundation.org, mgorman@suse.de, hannes@cmpxchg.org, tony.luck@intel.com, matthew.garrett@nebula.com, dave@sr71.net, riel@redhat.com, arjan@linux.intel.com, srinivas.pandruvada@linux.intel.com, willy@linux.intel.com, kamezawa.hiroyu@jp.fujitsu.com, lenb@kernel.org, rjw@sisk.pl Cc: gargankita@gmail.com, paulmck@linux.vnet.ibm.com, svaidy@linux.vnet.ibm.com, andi@firstfloor.org, isimatu.yasuaki@jp.fujitsu.com, santosh.shilimkar@ti.com, kosaki.motohiro@gmail.com, srivatsa.bhat@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Fri, 30 Aug 2013 18:46:56 +0530 Message-ID: <20130830131654.4947.85409.stgit@srivatsabhat.in.ibm.com> In-Reply-To: <20130830131221.4947.99764.stgit@srivatsabhat.in.ibm.com> References: <20130830131221.4947.99764.stgit@srivatsabhat.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13083013-5806-0000-0000-000022964B7B Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-9.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP While merging buddy free pages of a given order to make a higher order page, the buddy allocator might coalesce pages belonging to *two* *different* migratetypes of that order! So, don't assume that both the buddies come from the same freelist; instead, explicitly find out the migratetype info of the buddy page and use it while merging the buddies. Also, set the freepage migratetype of the buddy to the new one. Signed-off-by: Srivatsa S. Bhat --- mm/page_alloc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b4b1275..07ac019 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -681,10 +681,14 @@ static inline void __free_one_page(struct page *page, __mod_zone_freepage_state(zone, 1 << order, migratetype); } else { + int mt; + area = &zone->free_area[order]; - del_from_freelist(buddy, &area->free_list[migratetype]); + mt = get_freepage_migratetype(buddy); + del_from_freelist(buddy, &area->free_list[mt]); area->nr_free--; rmv_page_order(buddy); + set_freepage_migratetype(buddy, migratetype); } combined_idx = buddy_idx & page_idx; page = page + (combined_idx - page_idx);