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Diffstat (limited to 'Documentation/accounting/taskstats-struct.txt')
| -rw-r--r-- | Documentation/accounting/taskstats-struct.txt | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/Documentation/accounting/taskstats-struct.txt b/Documentation/accounting/taskstats-struct.txt deleted file mode 100644 index e7512c061c15..000000000000 --- a/Documentation/accounting/taskstats-struct.txt +++ /dev/null @@ -1,180 +0,0 @@ -The struct taskstats --------------------- - -This document contains an explanation of the struct taskstats fields. - -There are three different groups of fields in the struct taskstats: - -1) Common and basic accounting fields - If CONFIG_TASKSTATS is set, the taskstats interface 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. - -4) Per-task and per-thread context switch count statistics - -5) Time accounting for SMT machines - -6) Extended delay accounting fields for memory reclaim - -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. - - -struct taskstats { - -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; - - /* The exit code of a task. */ - __u32 ac_exitcode; /* Exit status */ - - /* 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 */ - - /* The value of task_nice() of a task. */ - __u8 ac_nice; /* task_nice */ - - /* The name of the command that started this task. */ - char ac_comm[TS_COMM_LEN]; /* Command name */ - - /* The scheduling discipline as set in task->policy field. */ - __u8 ac_sched; /* Scheduling discipline */ - - __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 */ - - /* The time when a task begins, in [secs] since 1970. */ - __u32 ac_btime; /* Begin time [sec since 1970] */ - - /* The elapsed time of a task, in [usec]. */ - __u64 ac_etime; /* Elapsed time [usec] */ - - /* The user CPU time of a task, in [usec]. */ - __u64 ac_utime; /* User CPU time [usec] */ - - /* The system CPU time of a task, in [usec]. */ - __u64 ac_stime; /* System CPU time [usec] */ - - /* The minor page fault count of a task, as set in task->min_flt. */ - __u64 ac_minflt; /* Minor Page Fault Count */ - - /* The major page fault count of a task, as set in task->maj_flt. */ - __u64 ac_majflt; /* Major Page Fault Count */ - - -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 - */ - - /* Delay waiting for cpu, while runnable - * count, delay_total NOT updated atomically - */ - __u64 cpu_count; - __u64 cpu_delay_total; - - /* Following four fields atomically updated using task->delays->lock */ - - /* 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; - - /* Delay waiting for page fault I/O (swap in only) */ - __u64 swapin_count; - __u64 swapin_delay_total; - - /* 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; - - /* 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 */ - - -3) Extended accounting fields - /* Extended accounting fields start */ - - /* 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 */ - - /* 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 */ - - /* High watermark of RSS usage in duration of a task, in KBytes. */ - __u64 hiwater_rss; /* High-watermark of RSS usage */ - - /* High watermark of VM usage in duration of a task, in KBytes. */ - __u64 hiwater_vm; /* High-water virtual memory usage */ - - /* 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 */ - - /* Extended accounting fields end */ - -4) Per-task and per-thread statistics - __u64 nvcsw; /* Context voluntary switch counter */ - __u64 nivcsw; /* Context involuntary switch counter */ - -5) Time accounting for SMT machines - __u64 ac_utimescaled; /* utime scaled on frequency etc */ - __u64 ac_stimescaled; /* stime scaled on frequency etc */ - __u64 cpu_scaled_run_real_total; /* scaled cpu_run_real_total */ - -6) Extended delay accounting fields for memory reclaim - /* Delay waiting for memory reclaim */ - __u64 freepages_count; - __u64 freepages_delay_total; -} |