From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756135AbaC0LGL (ORCPT ); Thu, 27 Mar 2014 07:06:11 -0400 Received: from mail-pb0-f47.google.com ([209.85.160.47]:35336 "EHLO mail-pb0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755086AbaC0LGF (ORCPT ); Thu, 27 Mar 2014 07:06:05 -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: Thu, 27 Mar 2014 19:05:43 +0800 Message-Id: <1395918343-6775-1-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 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 | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/percpu.c b/mm/percpu.c index 036cfe0..cfda29c 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -506,9 +506,11 @@ static int pcpu_alloc_area(struct pcpu_chunk *chunk, int size, int align) * uncommon for percpu allocations. */ if (head && (head < sizeof(int) || chunk->map[i - 1] > 0)) { - if (chunk->map[i - 1] > 0) + if (chunk->map[i - 1] > 0) { chunk->map[i - 1] += head; - else { + max_contig = + max(chunk->map[i - 1], max_contig); + } else { chunk->map[i - 1] -= head; chunk->free_size -= head; } -- 1.8.5.3