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Message-ID: <20100426171830.GC3372@redhat.com>
Date: Mon, 26 Apr 2010 13:18:30 -0400
From: Vivek Goyal <vgoyal@...hat.com>
To: linux kernel mailing list <linux-kernel@...r.kernel.org>,
Jens Axboe <jens.axboe@...cle.com>
Cc: Divyesh Shah <dpshah@...gle.com>,
Nauman Rafique <nauman@...gle.com>,
Gui Jianfeng <guijianfeng@...fujitsu.com>
Subject: Re: [PATCH] blk-cgroup: config options re-arrangement
On Thu, Apr 22, 2010 at 06:37:05PM -0400, Vivek Goyal wrote:
> This patch fixes few usability and configurability issues.
>
> o All the cgroup based controller options are configurable from
> "Genral Setup/Control Group Support/" menu. blkio is the only exception.
> Hence make this option visible in above menu and make it configurable from
> there to bring it inline with rest of the cgroup based controllers.
>
Hi Jens,
Do you have any concerns with this patch? If not, can you please include
it.
Thanks
Vivek
> o Get rid of CONFIG_DEBUG_CFQ_IOSCHED.
>
> This option currently does two things.
>
> - Enable printing of cgroup paths in blktrace
> - Enables CONFIG_DEBUG_BLK_CGROUP, which in turn displays additional stat
> files in cgroup.
>
> If we are using group scheduling, blktrace data is of not really much use
> if cgroup information is not present. To get this data, currently one has to
> also enable CONFIG_DEBUG_CFQ_IOSCHED, which in turn brings the overhead of
> all the additional debug stat files which is not desired.
>
> Hence, this patch moves printing of cgroup paths under
> CONFIG_CFQ_GROUP_IOSCHED.
>
> This allows us to get rid of CONFIG_DEBUG_CFQ_IOSCHED completely. Now all
> the debug stat files are controlled only by CONFIG_DEBUG_BLK_CGROUP which
> can be enabled through config menu.
>
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
> ---
> Documentation/cgroups/blkio-controller.txt | 35 ++++++++++++----------------
> block/Kconfig | 23 ------------------
> block/Kconfig.iosched | 16 ++++--------
> block/blk-cgroup.c | 2 -
> block/blk-cgroup.h | 14 +++++-----
> block/cfq-iosched.c | 2 +-
> init/Kconfig | 27 +++++++++++++++++++++
> 7 files changed, 55 insertions(+), 64 deletions(-)
>
> diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
> index d422b41..48e0b21 100644
> --- a/Documentation/cgroups/blkio-controller.txt
> +++ b/Documentation/cgroups/blkio-controller.txt
> @@ -17,6 +17,9 @@ HOWTO
> You can do a very simple testing of running two dd threads in two different
> cgroups. Here is what you can do.
>
> +- Enable Block IO controller
> + CONFIG_BLK_CGROUP=y
> +
> - Enable group scheduling in CFQ
> CONFIG_CFQ_GROUP_IOSCHED=y
>
> @@ -54,24 +57,16 @@ cgroups. Here is what you can do.
>
> Various user visible config options
> ===================================
> -CONFIG_CFQ_GROUP_IOSCHED
> - - Enables group scheduling in CFQ. Currently only 1 level of group
> - creation is allowed.
> -
> -CONFIG_DEBUG_CFQ_IOSCHED
> - - Enables some debugging messages in blktrace. Also creates extra
> - cgroup file blkio.dequeue.
> -
> -Config options selected automatically
> -=====================================
> -These config options are not user visible and are selected/deselected
> -automatically based on IO scheduler configuration.
> -
> CONFIG_BLK_CGROUP
> - - Block IO controller. Selected by CONFIG_CFQ_GROUP_IOSCHED.
> + - Block IO controller.
>
> CONFIG_DEBUG_BLK_CGROUP
> - - Debug help. Selected by CONFIG_DEBUG_CFQ_IOSCHED.
> + - Debug help. Right now some additional stats file show up in cgroup
> + if this option is enabled.
> +
> +CONFIG_CFQ_GROUP_IOSCHED
> + - Enables group scheduling in CFQ. Currently only 1 level of group
> + creation is allowed.
>
> Details of cgroup files
> =======================
> @@ -174,13 +169,13 @@ Details of cgroup files
> write, sync or async.
>
> - blkio.avg_queue_size
> - - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y.
> + - Debugging aid only enabled if CONFIG_DEBUG_BLK_CGROUP=y.
> The average queue size for this cgroup over the entire time of this
> cgroup's existence. Queue size samples are taken each time one of the
> queues of this cgroup gets a timeslice.
>
> - blkio.group_wait_time
> - - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y.
> + - Debugging aid only enabled if CONFIG_DEBUG_BLK_CGROUP=y.
> This is the amount of time the cgroup had to wait since it became busy
> (i.e., went from 0 to 1 request queued) to get a timeslice for one of
> its queues. This is different from the io_wait_time which is the
> @@ -191,7 +186,7 @@ Details of cgroup files
> got a timeslice and will not include the current delta.
>
> - blkio.empty_time
> - - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y.
> + - Debugging aid only enabled if CONFIG_DEBUG_BLK_CGROUP=y.
> This is the amount of time a cgroup spends without any pending
> requests when not being served, i.e., it does not include any time
> spent idling for one of the queues of the cgroup. This is in
> @@ -200,7 +195,7 @@ Details of cgroup files
> time it had a pending request and will not include the current delta.
>
> - blkio.idle_time
> - - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y.
> + - Debugging aid only enabled if CONFIG_DEBUG_BLK_CGROUP=y.
> This is the amount of time spent by the IO scheduler idling for a
> given cgroup in anticipation of a better request than the exising ones
> from other queues/cgroups. This is in nanoseconds. If this is read
> @@ -209,7 +204,7 @@ Details of cgroup files
> the current delta.
>
> - blkio.dequeue
> - - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y. This
> + - Debugging aid only enabled if CONFIG_DEBUG_BLK_CGROUP=y. This
> gives the statistics about how many a times a group was dequeued
> from service tree of the device. First two fields specify the major
> and minor number of the device and third field specifies the number
> diff --git a/block/Kconfig b/block/Kconfig
> index f9e89f4..9be0b56 100644
> --- a/block/Kconfig
> +++ b/block/Kconfig
> @@ -77,29 +77,6 @@ config BLK_DEV_INTEGRITY
> T10/SCSI Data Integrity Field or the T13/ATA External Path
> Protection. If in doubt, say N.
>
> -config BLK_CGROUP
> - tristate "Block cgroup support"
> - depends on CGROUPS
> - depends on CFQ_GROUP_IOSCHED
> - default n
> - ---help---
> - Generic block IO controller cgroup interface. This is the common
> - cgroup interface which should be used by various IO controlling
> - policies.
> -
> - Currently, CFQ IO scheduler uses it to recognize task groups and
> - control disk bandwidth allocation (proportional time slice allocation)
> - to such task groups.
> -
> -config DEBUG_BLK_CGROUP
> - bool
> - depends on BLK_CGROUP
> - default n
> - ---help---
> - Enable some debugging help. Currently it stores the cgroup path
> - in the blk group which can be used by cfq for tracing various
> - group related activity.
> -
> endif # BLOCK
>
> config BLOCK_COMPAT
> diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
> index fc71cf0..3199b76 100644
> --- a/block/Kconfig.iosched
> +++ b/block/Kconfig.iosched
> @@ -23,7 +23,8 @@ config IOSCHED_DEADLINE
>
> config IOSCHED_CFQ
> tristate "CFQ I/O scheduler"
> - select BLK_CGROUP if CFQ_GROUP_IOSCHED
> + # If BLK_CGROUP is a module, CFQ has to be built as module.
> + depends on (BLK_CGROUP=m && m) || !BLK_CGROUP || BLK_CGROUP=y
> default y
> ---help---
> The CFQ I/O scheduler tries to distribute bandwidth equally
> @@ -33,22 +34,15 @@ config IOSCHED_CFQ
>
> This is the default I/O scheduler.
>
> + Note: If BLK_CGROUP=m, then CFQ can be built only as module.
> +
> config CFQ_GROUP_IOSCHED
> bool "CFQ Group Scheduling support"
> - depends on IOSCHED_CFQ && CGROUPS
> + depends on IOSCHED_CFQ && BLK_CGROUP
> default n
> ---help---
> Enable group IO scheduling in CFQ.
>
> -config DEBUG_CFQ_IOSCHED
> - bool "Debug CFQ Scheduling"
> - depends on CFQ_GROUP_IOSCHED
> - select DEBUG_BLK_CGROUP
> - default n
> - ---help---
> - Enable CFQ IO scheduling debugging in CFQ. Currently it makes
> - blktrace output more verbose.
> -
> choice
> prompt "Default I/O scheduler"
> default DEFAULT_CFQ
> diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
> index 83930f6..92d3b74 100644
> --- a/block/blk-cgroup.c
> +++ b/block/blk-cgroup.c
> @@ -348,10 +348,8 @@ void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
> blkg->blkcg_id = css_id(&blkcg->css);
> hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);
> spin_unlock_irqrestore(&blkcg->lock, flags);
> -#ifdef CONFIG_DEBUG_BLK_CGROUP
> /* Need to take css reference ? */
> cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
> -#endif
> blkg->dev = dev;
> }
> EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group);
> diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
> index 2c956a0..8a357f1 100644
> --- a/block/blk-cgroup.h
> +++ b/block/blk-cgroup.h
> @@ -108,10 +108,8 @@ struct blkio_group {
> void *key;
> struct hlist_node blkcg_node;
> unsigned short blkcg_id;
> -#ifdef CONFIG_DEBUG_BLK_CGROUP
> /* Store cgroup path */
> char path[128];
> -#endif
> /* The device MKDEV(major, minor), this group has been created for */
> dev_t dev;
>
> @@ -147,6 +145,11 @@ struct blkio_policy_type {
> extern void blkio_policy_register(struct blkio_policy_type *);
> extern void blkio_policy_unregister(struct blkio_policy_type *);
>
> +static inline char *blkg_path(struct blkio_group *blkg)
> +{
> + return blkg->path;
> +}
> +
> #else
>
> struct blkio_group {
> @@ -158,6 +161,8 @@ struct blkio_policy_type {
> static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
> static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
>
> +static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
> +
> #endif
>
> #define BLKIO_WEIGHT_MIN 100
> @@ -165,10 +170,6 @@ static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
> #define BLKIO_WEIGHT_DEFAULT 500
>
> #ifdef CONFIG_DEBUG_BLK_CGROUP
> -static inline char *blkg_path(struct blkio_group *blkg)
> -{
> - return blkg->path;
> -}
> void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
> void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> unsigned long dequeue);
> @@ -197,7 +198,6 @@ BLKG_FLAG_FNS(idling)
> BLKG_FLAG_FNS(empty)
> #undef BLKG_FLAG_FNS
> #else
> -static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
> static inline void blkiocg_update_avg_queue_size_stats(
> struct blkio_group *blkg) {}
> static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index d5927b5..5fa0e98 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -345,7 +345,7 @@ CFQ_CFQQ_FNS(deep);
> CFQ_CFQQ_FNS(wait_busy);
> #undef CFQ_CFQQ_FNS
>
> -#ifdef CONFIG_DEBUG_CFQ_IOSCHED
> +#ifdef CONFIG_CFQ_GROUP_IOSCHED
> #define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
> blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
> cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
> diff --git a/init/Kconfig b/init/Kconfig
> index eb77e8c..087c14f 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -612,6 +612,33 @@ config RT_GROUP_SCHED
>
> endif #CGROUP_SCHED
>
> +config BLK_CGROUP
> + tristate "Block IO controller"
> + depends on CGROUPS && BLOCK
> + default n
> + ---help---
> + Generic block IO controller cgroup interface. This is the common
> + cgroup interface which should be used by various IO controlling
> + policies.
> +
> + Currently, CFQ IO scheduler uses it to recognize task groups and
> + control disk bandwidth allocation (proportional time slice allocation)
> + to such task groups.
> +
> + This option only enables generic Block IO controller infrastructure.
> + One needs to also enable actual IO controlling logic in CFQ for it
> + to take effect. (CONFIG_CFQ_GROUP_IOSCHED=y).
> +
> + See Documentation/cgroups/blkio-controller.txt for more information.
> +
> +config DEBUG_BLK_CGROUP
> + bool "Enable Block IO controller debugging"
> + depends on BLK_CGROUP
> + default n
> + ---help---
> + Enable some debugging help. Currently it exports additional stat
> + files in a cgroup which can be useful for debugging.
> +
> endif # CGROUPS
>
> config MM_OWNER
> --
> 1.6.2.5
>
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