Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754962Ab3CEXiT (ORCPT ); Tue, 5 Mar 2013 18:38:19 -0500 Received: from mail-ia0-f176.google.com ([209.85.210.176]:53415 "EHLO mail-ia0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753575Ab3CEXiQ (ORCPT ); Tue, 5 Mar 2013 18:38:16 -0500 Date: Tue, 5 Mar 2013 18:38:12 -0500 From: Andrew Shewmaker To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk, simon.jeons@gmail.com, ric.masonn@gmail.com Subject: [PATCH v4 001/002] mm: limit growth of 3% hardcoded other user reserve Message-ID: <20130305233811.GA1948@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1798 Lines: 55 Limit the growth of the memory reserved for other processes to the smaller of 3% or 8MB. This affects only OVERCOMMIT_NEVER. Signed-off-by: Andrew Shewmaker --- Rebased onto v3.8-mmotm-2013-03-01-15-50 No longer assumes 4kb pages. Code duplicated for nommu. diff --git a/mm/mmap.c b/mm/mmap.c index 49dc7d5..4eb2b1a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -184,9 +184,11 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) allowed += total_swap_pages; /* Don't let a single process grow too big: - leave 3% of the size of this process for other processes */ + * leave the smaller of 3% of the size of this process + * or 8MB for other processes + */ if (mm) - allowed -= mm->total_vm / 32; + allowed -= min(mm->total_vm / 32, 1 << (23 - PAGE_SHIFT)); if (percpu_counter_read_positive(&vm_committed_as) < allowed) return 0; diff --git a/mm/nommu.c b/mm/nommu.c index f5d57a3..a93d214 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1945,9 +1945,11 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) allowed += total_swap_pages; /* Don't let a single process grow too big: - leave 3% of the size of this process for other processes */ + * leave the smaller of 3% of the size of this process + * or 8MB for other processes + */ if (mm) - allowed -= mm->total_vm / 32; + allowed -= min(mm->total_vm / 32, 1 << (23 - PAGE_SHIFT)); if (percpu_counter_read_positive(&vm_committed_as) < allowed) return 0; -- 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/