From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751526AbaC1Mzc (ORCPT ); Fri, 28 Mar 2014 08:55:32 -0400 Received: from mail-pa0-f42.google.com ([209.85.220.42]:40446 "EHLO mail-pa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164AbaC1Mza (ORCPT ); Fri, 28 Mar 2014 08:55:30 -0400 From: Jianyu Zhan To: linux-mm@kvack.org Cc: akpm@linux-foundation.org, tj@kernel.org, cl@linux-foundation.org, linux-kernel@vger.kernel.org, nasa4836@gmail.com Subject: [PATCH 1/2] mm/percpu.c: renew the max_contig if we merge the head and previous block Date: Fri, 28 Mar 2014 20:55:21 +0800 Message-Id: <1396011321-19759-1-git-send-email-nasa4836@gmail.com> X-Mailer: git-send-email 1.8.5.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, tj, I've reworked the patches on top of percpu/for-3.15. During pcpu_alloc_area(), we might merge the current head with the previous block. Since we have calculated the max_contig using the size of previous block before we skip it, and now we update the size of previous block, so we should renew the max_contig. Signed-off-by: Jianyu Zhan --- mm/percpu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/percpu.c b/mm/percpu.c index 202e104..63e24fb 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -473,9 +473,11 @@ static int pcpu_alloc_area(struct pcpu_chunk *chunk, int size, int align) * uncommon for percpu allocations. */ if (head && (head < sizeof(int) || !(p[-1] & 1))) { + *p = off += head; if (p[-1] & 1) chunk->free_size -= head; - *p = off += head; + else + max_contig = max(*p - p[-1], max_contig); this_size -= head; head = 0; } -- 1.8.5.3