On Tue, 16 Nov 2010 11:17:26 +0100 Michal Hocko <mhocko@xxxxxxx> wrote: > Hi Andrew, > could you consider the following patch for the Linus tree, please? > The discussion took place in this email thread > http://lkml.org/lkml/2010/11/10/114. > The patch is based on top of 151f52f09c572 commit in the Linus tree. > > Please let me know if there I should route this patch through somebody > else. > > Thanks! > > --- > >From 30238aaec758988493af793939f14b0ba83dc4b3 Mon Sep 17 00:00:00 2001 > From: Michal Hocko <mhocko@xxxxxxx> > Date: Wed, 10 Nov 2010 13:30:04 +0100 > Subject: [PATCH] Make swap accounting default behavior configurable > > Swap accounting can be configured by CONFIG_CGROUP_MEM_RES_CTLR_SWAP > configuration option and then it is turned on by default. There is > a boot option (noswapaccount) which can disable this feature. > > This makes it hard for distributors to enable the configuration option > as this feature leads to a bigger memory consumption and this is a no-go > for general purpose distribution kernel. On the other hand swap > accounting may be very usuful for some workloads. This patch is needed by distros, and distros use the -stable tree, I assume. Do you see reasons why this patch should be backported into -stable, so distros don't need to patch it themselves? If so, any particular kernel versions? 2.6.37? > This patch adds a new configuration option which controls the default > behavior (CGROUP_MEM_RES_CTLR_SWAP_ENABLED). If the option is selected > then the feature is turned on by default. > > It also adds a new boot parameter swapaccount which (contrary to > noswapaccount) enables the feature. (I would consider swapaccount=yes|no > semantic with removed noswapaccount parameter much better but this > parameter is kind of API which might be in use and unexpected breakage > is no-go.) > > The default behavior is unchanged (if CONFIG_CGROUP_MEM_RES_CTLR_SWAP is > enabled then CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED is enabled as well) > > Signed-off-by: Michal Hocko <mhocko@xxxxxxx> > Acked-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx> > --- > Documentation/kernel-parameters.txt | 3 +++ > init/Kconfig | 13 +++++++++++++ > mm/memcontrol.c | 15 ++++++++++++++- > 3 files changed, 30 insertions(+), 1 deletions(-) > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt > index ed45e98..14eafa5 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -2385,6 +2385,9 @@ and is between 256 and 4096 characters. It is defined in the file > improve throughput, but will also increase the > amount of memory reserved for use by the client. > > + swapaccount [KNL] Enable accounting of swap in memory resource > + controller. (See Documentation/cgroups/memory.txt) So we have swapaccount and noswapaccount. Ho hum, "swapaccount=[1|0]" would have been better. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>