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[PATCH] csa accounting taskstats update
ChangeLog:
Feedbacks from Andrew Morton:
- define TS_COMM_LEN to 32
- change acct_stimexpd field of task_struct to be of
cputime_t, which is to be used to save the tsk->stime
of last timer interrupt update.
- a new Documentation/accounting/taskstats-struct.txt
to describe fields of taskstats struct.
Feedback from Balbir Singh:
- keep the stime of a task to be zero when both stime
and utime are zero as recoreded in task_struct.
Misc:
- convert accumulated RSS/VM from platform dependent
pages-ticks to MBytes-usecs in the kernel
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Chris Sturtivant <csturtiv@sgi.com>
Cc: Tony Ernst <tee@sgi.com>
Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>- Loading branch information
Jay Lan
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Linus Torvalds
committed
Oct 1, 2006
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| The struct taskstats | ||
| -------------------- | ||
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| This document contains an explanation of the struct taskstats fields. | ||
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| There are three different groups of fields in the struct taskstats: | ||
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| 1) Common and basic accounting fields | ||
| If CONFIG_TASKSTATS is set, the taskstats inteface is enabled and | ||
| the common fields and basic accounting fields are collected for | ||
| delivery at do_exit() of a task. | ||
| 2) Delay accounting fields | ||
| These fields are placed between | ||
| /* Delay accounting fields start */ | ||
| and | ||
| /* Delay accounting fields end */ | ||
| Their values are collected if CONFIG_TASK_DELAY_ACCT is set. | ||
| 3) Extended accounting fields | ||
| These fields are placed between | ||
| /* Extended accounting fields start */ | ||
| and | ||
| /* Extended accounting fields end */ | ||
| Their values are collected if CONFIG_TASK_XACCT is set. | ||
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| Future extension should add fields to the end of the taskstats struct, and | ||
| should not change the relative position of each field within the struct. | ||
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| struct taskstats { | ||
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| 1) Common and basic accounting fields: | ||
| /* The version number of this struct. This field is always set to | ||
| * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>. | ||
| * Each time the struct is changed, the value should be incremented. | ||
| */ | ||
| __u16 version; | ||
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| /* The exit code of a task. */ | ||
| __u32 ac_exitcode; /* Exit status */ | ||
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| /* The accounting flags of a task as defined in <linux/acct.h> | ||
| * Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG. | ||
| */ | ||
| __u8 ac_flag; /* Record flags */ | ||
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| /* The value of task_nice() of a task. */ | ||
| __u8 ac_nice; /* task_nice */ | ||
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| /* The name of the command that started this task. */ | ||
| char ac_comm[TS_COMM_LEN]; /* Command name */ | ||
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| /* The scheduling discipline as set in task->policy field. */ | ||
| __u8 ac_sched; /* Scheduling discipline */ | ||
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| __u8 ac_pad[3]; | ||
| __u32 ac_uid; /* User ID */ | ||
| __u32 ac_gid; /* Group ID */ | ||
| __u32 ac_pid; /* Process ID */ | ||
| __u32 ac_ppid; /* Parent process ID */ | ||
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| /* The time when a task begins, in [secs] since 1970. */ | ||
| __u32 ac_btime; /* Begin time [sec since 1970] */ | ||
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| /* The elapsed time of a task, in [usec]. */ | ||
| __u64 ac_etime; /* Elapsed time [usec] */ | ||
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| /* The user CPU time of a task, in [usec]. */ | ||
| __u64 ac_utime; /* User CPU time [usec] */ | ||
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| /* The system CPU time of a task, in [usec]. */ | ||
| __u64 ac_stime; /* System CPU time [usec] */ | ||
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| /* The minor page fault count of a task, as set in task->min_flt. */ | ||
| __u64 ac_minflt; /* Minor Page Fault Count */ | ||
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| /* The major page fault count of a task, as set in task->maj_flt. */ | ||
| __u64 ac_majflt; /* Major Page Fault Count */ | ||
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| 2) Delay accounting fields: | ||
| /* Delay accounting fields start | ||
| * | ||
| * All values, until the comment "Delay accounting fields end" are | ||
| * available only if delay accounting is enabled, even though the last | ||
| * few fields are not delays | ||
| * | ||
| * xxx_count is the number of delay values recorded | ||
| * xxx_delay_total is the corresponding cumulative delay in nanoseconds | ||
| * | ||
| * xxx_delay_total wraps around to zero on overflow | ||
| * xxx_count incremented regardless of overflow | ||
| */ | ||
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| /* Delay waiting for cpu, while runnable | ||
| * count, delay_total NOT updated atomically | ||
| */ | ||
| __u64 cpu_count; | ||
| __u64 cpu_delay_total; | ||
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| /* Following four fields atomically updated using task->delays->lock */ | ||
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| /* Delay waiting for synchronous block I/O to complete | ||
| * does not account for delays in I/O submission | ||
| */ | ||
| __u64 blkio_count; | ||
| __u64 blkio_delay_total; | ||
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| /* Delay waiting for page fault I/O (swap in only) */ | ||
| __u64 swapin_count; | ||
| __u64 swapin_delay_total; | ||
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| /* cpu "wall-clock" running time | ||
| * On some architectures, value will adjust for cpu time stolen | ||
| * from the kernel in involuntary waits due to virtualization. | ||
| * Value is cumulative, in nanoseconds, without a corresponding count | ||
| * and wraps around to zero silently on overflow | ||
| */ | ||
| __u64 cpu_run_real_total; | ||
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| /* cpu "virtual" running time | ||
| * Uses time intervals seen by the kernel i.e. no adjustment | ||
| * for kernel's involuntary waits due to virtualization. | ||
| * Value is cumulative, in nanoseconds, without a corresponding count | ||
| * and wraps around to zero silently on overflow | ||
| */ | ||
| __u64 cpu_run_virtual_total; | ||
| /* Delay accounting fields end */ | ||
| /* version 1 ends here */ | ||
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| 3) Extended accounting fields | ||
| /* Extended accounting fields start */ | ||
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| /* Accumulated RSS usage in duration of a task, in MBytes-usecs. | ||
| * The current rss usage is added to this counter every time | ||
| * a tick is charged to a task's system time. So, at the end we | ||
| * will have memory usage multiplied by system time. Thus an | ||
| * average usage per system time unit can be calculated. | ||
| */ | ||
| __u64 coremem; /* accumulated RSS usage in MB-usec */ | ||
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| /* Accumulated virtual memory usage in duration of a task. | ||
| * Same as acct_rss_mem1 above except that we keep track of VM usage. | ||
| */ | ||
| __u64 virtmem; /* accumulated VM usage in MB-usec */ | ||
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| /* High watermark of RSS usage in duration of a task, in KBytes. */ | ||
| __u64 hiwater_rss; /* High-watermark of RSS usage */ | ||
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| /* High watermark of VM usage in duration of a task, in KBytes. */ | ||
| __u64 hiwater_vm; /* High-water virtual memory usage */ | ||
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| /* The following four fields are I/O statistics of a task. */ | ||
| __u64 read_char; /* bytes read */ | ||
| __u64 write_char; /* bytes written */ | ||
| __u64 read_syscalls; /* read syscalls */ | ||
| __u64 write_syscalls; /* write syscalls */ | ||
|
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| /* Extended accounting fields end */ | ||
|
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| } |
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