diff options
| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-01-25 21:08:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 21:08:34 +0100 |
| commit | 9745512ce79de686df354dc70a8d1a74d801892d (patch) | |
| tree | 9b64e2b2e6d2ae534beef136922082f21701c7b9 /fs | |
| parent | 326587b840785c60f5dc18557235a23bafefd620 (diff) | |
sched: latencytop support
LatencyTOP kernel infrastructure; it measures latencies in the
scheduler and tracks it system wide and per process.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/base.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 7411bfb0b7c..91fa8e6ce8a 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -310,6 +310,77 @@ static int proc_pid_schedstat(struct task_struct *task, char *buffer) } #endif +#ifdef CONFIG_LATENCYTOP +static int lstats_show_proc(struct seq_file *m, void *v) +{ + int i; + struct task_struct *task = m->private; + seq_puts(m, "Latency Top version : v0.1\n"); + + for (i = 0; i < 32; i++) { + if (task->latency_record[i].backtrace[0]) { + int q; + seq_printf(m, "%i %li %li ", + task->latency_record[i].count, + task->latency_record[i].time, + task->latency_record[i].max); + for (q = 0; q < LT_BACKTRACEDEPTH; q++) { + char sym[KSYM_NAME_LEN]; + char *c; + if (!task->latency_record[i].backtrace[q]) + break; + if (task->latency_record[i].backtrace[q] == ULONG_MAX) + break; + sprint_symbol(sym, task->latency_record[i].backtrace[q]); + c = strchr(sym, '+'); + if (c) + *c = 0; + seq_printf(m, "%s ", sym); + } + seq_printf(m, "\n"); + } + + } + return 0; +} + +static int lstats_open(struct inode *inode, struct file *file) +{ + int ret; + struct seq_file *m; + struct task_struct *task = get_proc_task(inode); + + ret = single_open(file, lstats_show_proc, NULL); + if (!ret) { + m = file->private_data; + m->private = task; + } + return ret; +} + +static ssize_t lstats_write(struct file *file, const char __user *buf, + size_t count, loff_t *offs) +{ + struct seq_file *m; + struct task_struct *task; + + m = file->private_data; + task = m->private; + clear_all_latency_tracing(task); + + return count; +} + +static const struct file_operations proc_lstats_operations = { + .open = lstats_open, + .read = seq_read, + .write = lstats_write, + .llseek = seq_lseek, + .release = single_release, +}; + +#endif + /* The badness from the OOM killer */ unsigned long badness(struct task_struct *p, unsigned long uptime); static int proc_oom_score(struct task_struct *task, char *buffer) @@ -1020,6 +1091,7 @@ static const struct file_operations proc_fault_inject_operations = { }; #endif + #ifdef CONFIG_SCHED_DEBUG /* * Print out various scheduling related per-task fields: @@ -2230,6 +2302,9 @@ static const struct pid_entry tgid_base_stuff[] = { #ifdef CONFIG_SCHEDSTATS INF("schedstat", S_IRUGO, pid_schedstat), #endif +#ifdef CONFIG_LATENCYTOP + REG("latency", S_IRUGO, lstats), +#endif #ifdef CONFIG_PROC_PID_CPUSET REG("cpuset", S_IRUGO, cpuset), #endif @@ -2555,6 +2630,9 @@ static const struct pid_entry tid_base_stuff[] = { #ifdef CONFIG_SCHEDSTATS INF("schedstat", S_IRUGO, pid_schedstat), #endif +#ifdef CONFIG_LATENCYTOP + REG("latency", S_IRUGO, lstats), +#endif #ifdef CONFIG_PROC_PID_CPUSET REG("cpuset", S_IRUGO, cpuset), #endif |