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SubjectRe: [RFC PATCH] Make swap accounting default behavior configurable v3
Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>

Thank you for your work.
Daisuke Nishimura.

On Mon, 15 Nov 2010 09:35:40 +0100
Michal Hocko <mhocko@suse.cz> wrote:

> On Mon 15-11-10 10:13:35, Daisuke Nishimura wrote:
> > On Fri, 12 Nov 2010 09:31:03 +0100
> [...]
> > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> > > index ed45e98..7077148 100644
> > > --- a/Documentation/kernel-parameters.txt
> > > +++ b/Documentation/kernel-parameters.txt
> > > @@ -1752,6 +1752,8 @@ and is between 256 and 4096 characters. It is defined in the file
> > >
> > > noswapaccount [KNL] Disable accounting of swap in memory resource
> > > controller. (See Documentation/cgroups/memory.txt)
> > > + swapaccount [KNL] Enable accounting of swap in memory resource
> > > + controller. (See Documentation/cgroups/memory.txt)
> > >
> > > nosync [HW,M68K] Disables sync negotiation for all devices.
> > >
> > (I've add Andrew and Balbir to CC-list.)
> > It seems that almost all parameters are listed in alphabetic order in the document,
> > so I think it would be better to obey the rule.
>
> You are right. The header of the file says:
>
> " The following is a consolidated list of the kernel parameters as
> implemented (mostly) by the __setup() macro and sorted into English
> Dictionary order (defined as ignoring all punctuation and sorting digits
> before letters in a case insensitive manner), and with descriptions
> where known."
>
> Updated patch follows bellow.
>
> >
> > Thanks,
> > Daisuke Nishimura.
>
> Changes since v2:
> * put the new parameter description to the proper (alphabetically sorted)
> place in Documentation/kernel-parameters.txt
>
> Changes since v1:
> * do not remove noswapaccount parameter and add swapaccount parameter instead
> * Documentation/kernel-parameters.txt updated
> ---
>
> From 21df3801e2b65f47a2807534487ebb353dad6340 Mon Sep 17 00:00:00 2001
> From: Michal Hocko <mhocko@suse.cz>
> 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 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@suse.cz>
> ---
> 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)
> +
> swiotlb= [IA-64] Number of I/O TLB slabs
>
> switches= [HW,M68k]
> diff --git a/init/Kconfig b/init/Kconfig
> index 88c1046..c972899 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -613,6 +613,19 @@ config CGROUP_MEM_RES_CTLR_SWAP
> if boot option "noswapaccount" is set, swap will not be accounted.
> Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
> size is 4096bytes, 512k per 1Gbytes of swap.
> +config CGROUP_MEM_RES_CTLR_SWAP_ENABLED
> + bool "Memory Resource Controller Swap Extension enabled by default"
> + depends on CGROUP_MEM_RES_CTLR_SWAP
> + default y
> + help
> + Memory Resource Controller Swap Extension comes with its price in
> + a bigger memory consumption. General purpose distribution kernels
> + which want to enable the feautre but keep it disabled by default
> + and let the user enable it by swapaccount boot command line
> + parameter should have this option unselected.
> + For those who want to have the feature enabled by default should
> + select this option (if, for some reason, they need to disable it
> + then noswapaccount does the trick).
>
> menuconfig CGROUP_SCHED
> bool "Group CPU scheduler"
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 9a99cfa..4f479fe 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -61,7 +61,14 @@ struct mem_cgroup *root_mem_cgroup __read_mostly;
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
> /* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
> int do_swap_account __read_mostly;
> -static int really_do_swap_account __initdata = 1; /* for remember boot option*/
> +
> +/* for remember boot option*/
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED
> +static int really_do_swap_account __initdata = 1;
> +#else
> +static int really_do_swap_account __initdata = 0;
> +#endif
> +
> #else
> #define do_swap_account (0)
> #endif
> @@ -4909,6 +4916,12 @@ struct cgroup_subsys mem_cgroup_subsys = {
> };
>
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
> +static int __init enable_swap_account(char *s)
> +{
> + really_do_swap_account = 1;
> + return 1;
> +}
> +__setup("swapaccount", enable_swap_account);
>
> static int __init disable_swap_account(char *s)
> {
> --
> 1.7.2.3
>
> --
> Michal Hocko
> L3 team
> SUSE LINUX s.r.o.
> Lihovarska 1060/12
> 190 00 Praha 9
> Czech Republic


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