diff options
| -rw-r--r-- | Documentation/accounting/taskstats-struct.txt | 161 | ||||
| -rw-r--r-- | include/linux/sched.h | 2 | ||||
| -rw-r--r-- | include/linux/taskstats.h | 40 | ||||
| -rw-r--r-- | kernel/tsacct.c | 25 |
4 files changed, 207 insertions, 21 deletions
diff --git a/Documentation/accounting/taskstats-struct.txt b/Documentation/accounting/taskstats-struct.txt new file mode 100644 index 0000000..661c797 --- /dev/null +++ b/Documentation/accounting/taskstats-struct.txt @@ -0,0 +1,161 @@ +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 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. + +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 */ + +} diff --git a/include/linux/sched.h b/include/linux/sched.h index 4ddeb0f..7ef899c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -984,7 +984,7 @@ struct task_struct { #if defined(CONFIG_TASK_XACCT) u64 acct_rss_mem1; /* accumulated rss usage */ u64 acct_vm_mem1; /* accumulated virtual memory usage */ - clock_t acct_stimexpd; /* clock_t-converted stime since last update */ + cputime_t acct_stimexpd;/* stime since last update */ #endif #ifdef CONFIG_NUMA struct mempolicy *mempolicy; diff --git a/include/linux/taskstats.h b/include/linux/taskstats.h index 3d2c304..4524880 100644 --- a/include/linux/taskstats.h +++ b/include/linux/taskstats.h @@ -32,14 +32,21 @@ #define TASKSTATS_VERSION 2 -#define TS_COMM_LEN 16 /* should sync up with TASK_COMM_LEN +#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN * in linux/sched.h */ struct taskstats { - /* Version 1 */ + /* 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; - __u32 ac_exitcode; /* Exit status */ + __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 */ __u8 ac_nice; /* task_nice */ @@ -104,15 +111,30 @@ struct taskstats { __u64 ac_etime; /* Elapsed time [usec] */ __u64 ac_utime; /* User CPU time [usec] */ __u64 ac_stime; /* SYstem CPU time [usec] */ - __u64 ac_minflt; /* Minor Page Fault */ - __u64 ac_majflt; /* Major Page Fault */ + __u64 ac_minflt; /* Minor Page Fault Count */ + __u64 ac_majflt; /* Major Page Fault Count */ /* Basic Accounting Fields end */ /* Extended accounting fields start */ - __u64 acct_rss_mem1; /* accumulated rss usage */ - __u64 acct_vm_mem1; /* accumulated virtual memory usage */ - __u64 hiwater_rss; /* High-watermark of RSS usage */ - __u64 hiwater_vm; /* High-water virtual memory usage */ + /* 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 and virtual memory usage in duration of + * a task, in KBytes. + */ + __u64 hiwater_rss; /* High-watermark of RSS usage, in KB */ + __u64 hiwater_vm; /* High-water VM usage, in KB */ + + /* 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 */ diff --git a/kernel/tsacct.c b/kernel/tsacct.c index 47c71da..db44322 100644 --- a/kernel/tsacct.c +++ b/kernel/tsacct.c @@ -20,6 +20,7 @@ #include <linux/sched.h> #include <linux/tsacct_kern.h> #include <linux/acct.h> +#include <linux/jiffies.h> #define USEC_PER_TICK (USEC_PER_SEC/HZ) @@ -62,33 +63,35 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk) stats->ac_stime = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC; stats->ac_minflt = tsk->min_flt; stats->ac_majflt = tsk->maj_flt; - /* Each process gets a minimum of one usec cpu time */ - if ((stats->ac_utime == 0) && (stats->ac_stime == 0)) { - stats->ac_stime = 1; - } strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); } #ifdef CONFIG_TASK_XACCT + +#define KB 1024 +#define MB (1024*KB) /* * fill in extended accounting fields */ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) { - stats->acct_rss_mem1 = p->acct_rss_mem1; - stats->acct_vm_mem1 = p->acct_vm_mem1; + /* convert pages-jiffies to Mbyte-usec */ + stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB; + stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB; if (p->mm) { - stats->hiwater_rss = p->mm->hiwater_rss; - stats->hiwater_vm = p->mm->hiwater_vm; + /* adjust to KB unit */ + stats->hiwater_rss = p->mm->hiwater_rss * PAGE_SIZE / KB; + stats->hiwater_vm = p->mm->hiwater_vm * PAGE_SIZE / KB; } stats->read_char = p->rchar; stats->write_char = p->wchar; stats->read_syscalls = p->syscr; stats->write_syscalls = p->syscw; } - +#undef KB +#undef MB /** * acct_update_integrals - update mm integral fields in task_struct @@ -97,8 +100,8 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) void acct_update_integrals(struct task_struct *tsk) { if (likely(tsk->mm)) { - long delta = - cputime_to_jiffies(tsk->stime) - tsk->acct_stimexpd; + long delta = cputime_to_jiffies( + cputime_sub(tsk->stime, tsk->acct_stimexpd)); if (delta == 0) return; |
