lkml.org 
[lkml]   [2013]   [Nov]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 6/8] perf sched: Introduce timehist command
On 11/28/13, 2:50 AM, Namhyung Kim wrote:
>> +static inline void printf_nsecs(unsigned long long nsecs, int width_sec)
>> >+{
>> >+ unsigned long secs;
>> >+ unsigned long usecs;
>> >+
>> >+ secs = nsecs / NSECS_PER_SEC;
>> >+ nsecs -= secs * NSECS_PER_SEC;
>> >+ usecs = nsecs / NSECS_PER_USEC;
>> >+ printf("%*lu.%06lu ", width_sec, secs, usecs);
>> >+}
> It seems very similar to what timehist_time_str() does. Better to
> factor out?

yes and no. The above is used to dump time-based stats (time between
sched-in events, scheduling delay, and run time).

What I really want for timehist_time_str is time-of-day. And in local
variants of this code I have that. Until I can convince Peter, et al.
about the real need to pull perf_clock into userspace this is a bit of a
place holder so that local code and this version do not differ too much.

>
>
> [SNIP]
>> >+static unsigned int comm_width = 20;
>> >+
>> >+static char *timehist_get_commstr(struct thread *thread)
>> >+{
>> >+ static char str[32];
>> >+ const char *comm = thread__comm_str(thread);
>> >+ pid_t tid = thread->tid;
>> >+ pid_t pid = thread->pid_;
>> >+ unsigned int n;
>> >+
>> >+ if (pid == 0)
>> >+ scnprintf(str, sizeof(str), "%s", comm);
>> >+
>> >+ else if (tid != pid)
>> >+ scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid);
>> >+
>> >+ else
>> >+ scnprintf(str, sizeof(str), "%s[%d]", comm, tid);
>> >+
>> >+ n = strlen(str);
> Why not just using return value of scnprintf()?

right. will do.

>
>
>> >+ if (n > comm_width)
>> >+ comm_width = n;
>> >+
>> >+ return str;
>> >+}
>> >+
>> >+static void timehist_header(struct perf_sched *sched)
>> >+{
>> >+ u32 max_cpus = sched->max_cpu;
>> >+ u32 i, j;
>> >+
>> >+ printf("%15s %-4s", "time", "cpu");
>> >+
>> >+ if (sched->show_cpu_visual && max_cpus) {
>> >+ printf(" ");
>> >+ for (i = 0, j = 0; i < max_cpus; ++i) {
>> >+ printf("%x", j++);
>> >+ if (j > 15)
>> >+ j = 0;
>> >+ }
>> >+ printf(" ");
>> >+ }
>> >+
>> >+ printf(" %-20s %9s %9s %9s",
>> >+ "task name[tid/pid]", "b/n time", "sch delay", "run time");
>> >+
>> >+ if (sched->show_wakeups)
>> >+ printf(" %-20s", "wakeup");
>> >+
>> >+ printf("\n");
>> >+
>> >+ printf("%15s %4s", "---------------", "----");
> You might want to use "%.15s" and graph_dotted_line.

did not know about that. will update.


>> >+static void timehist_print_sample(struct perf_sched *sched,
>> >+ union perf_event *event,
>> >+ struct perf_evsel *evsel,
>> >+ struct perf_sample *sample,
>> >+ struct thread *thread,
>> >+ struct machine *machine)
>> >+{
>> >+ struct thread_runtime *tr = thread__priv(thread);
>> >+ char tstr[64];
>> >+ u32 max_cpus = sched->max_cpu;
>> >+
>> >+ printf("%15s ", timehist_time_str(tstr, sizeof(tstr), sample->time));
>> >+
>> >+ printf("[%02d] ", sample->cpu);
>> >+
>> >+ if (sched->show_cpu_visual && max_cpus) {
>> >+ u32 i;
>> >+ char c;
>> >+ for (i = 0; i < max_cpus; ++i) {
>> >+ if (i == sample->cpu)
>> >+ c = (thread->tid == 0) ? 'i' : 's';
> It'd better explaining what the 'i' and 's' mean..

visual aid: i = idle, s = sched-event. will add a comment.

>> >+static void free_idle_threads(void)
>> >+{
>> >+ int i;
>> >+
>> >+ if (idle_threads == NULL)
>> >+ return;
>> >+
>> >+ for (i = 0; i <= idle_max_cpu; ++i)
>> >+ free(idle_threads[i]);
> Doesn't it need to be thread__delete(idle_threads[i]) ?

yes. forgot to update this to the new api.

David



\
 
 \ /
  Last update: 2013-11-28 17:21    [W:0.076 / U:0.892 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site