846c7bb055
This patch is inspired by the discussion at http://lkml.org/lkml/2007/4/11/187 and implements per cgroup statistics as suggested by Andrew Morton in http://lkml.org/lkml/2007/4/11/263. The patch is on top of 2.6.21-mm1 with Paul's cgroups v9 patches (forward ported) This patch implements per cgroup statistics infrastructure and re-uses code from the taskstats interface. A new set of cgroup operations are registered with commands and attributes. It should be very easy to *extend* per cgroup statistics, by adding members to the cgroupstats structure. The current model for cgroupstats is a pull, a push model (to post statistics on interesting events), should be very easy to add. Currently user space requests for statistics by passing the cgroup file descriptor. Statistics about the state of all the tasks in the cgroup is returned to user space. TODO's/NOTE: This patch provides an infrastructure for implementing cgroup statistics. Based on the needs of each controller, we can incrementally add more statistics, event based support for notification of statistics, accumulation of taskstats into cgroup statistics in the future. Sample output # ./cgroupstats -C /cgroup/a sleeping 2, blocked 0, running 1, stopped 0, uninterruptible 0 # ./cgroupstats -C /cgroup/ sleeping 154, blocked 0, running 0, stopped 0, uninterruptible 0 If the approach looks good, I'll enhance and post the user space utility for the same Feedback, comments, test results are always welcome! [akpm@linux-foundation.org: build fix] Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Paul Menage <menage@google.com> Cc: Jay Lan <jlan@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* cgroupstats.h - exporting per-cgroup statistics
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*
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* Copyright IBM Corporation, 2007
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* Author Balbir Singh <balbir@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef _LINUX_CGROUPSTATS_H
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#define _LINUX_CGROUPSTATS_H
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#include <linux/taskstats.h>
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/*
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* Data shared between user space and kernel space on a per cgroup
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* basis. This data is shared using taskstats.
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*
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* Most of these states are derived by looking at the task->state value
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* For the nr_io_wait state, a flag in the delay accounting structure
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* indicates that the task is waiting on IO
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*
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* Each member is aligned to a 8 byte boundary.
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*/
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struct cgroupstats {
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__u64 nr_sleeping; /* Number of tasks sleeping */
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__u64 nr_running; /* Number of tasks running */
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__u64 nr_stopped; /* Number of tasks in stopped state */
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__u64 nr_uninterruptible; /* Number of tasks in uninterruptible */
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/* state */
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__u64 nr_io_wait; /* Number of tasks waiting on IO */
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};
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/*
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* Commands sent from userspace
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* Not versioned. New commands should only be inserted at the enum's end
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* prior to __CGROUPSTATS_CMD_MAX
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*/
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enum {
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CGROUPSTATS_CMD_UNSPEC = __TASKSTATS_CMD_MAX, /* Reserved */
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CGROUPSTATS_CMD_GET, /* user->kernel request/get-response */
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CGROUPSTATS_CMD_NEW, /* kernel->user event */
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__CGROUPSTATS_CMD_MAX,
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};
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#define CGROUPSTATS_CMD_MAX (__CGROUPSTATS_CMD_MAX - 1)
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enum {
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CGROUPSTATS_TYPE_UNSPEC = 0, /* Reserved */
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CGROUPSTATS_TYPE_CGROUP_STATS, /* contains name + stats */
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__CGROUPSTATS_TYPE_MAX,
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};
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#define CGROUPSTATS_TYPE_MAX (__CGROUPSTATS_TYPE_MAX - 1)
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enum {
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CGROUPSTATS_CMD_ATTR_UNSPEC = 0,
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CGROUPSTATS_CMD_ATTR_FD,
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__CGROUPSTATS_CMD_ATTR_MAX,
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};
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#define CGROUPSTATS_CMD_ATTR_MAX (__CGROUPSTATS_CMD_ATTR_MAX - 1)
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#endif /* _LINUX_CGROUPSTATS_H */
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