diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-18 10:57:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-18 10:57:09 -0700 |
| commit | 89fec7420354ff2d23ed46e62aaea402587efd1c (patch) | |
| tree | a26c8bce15f0047cfb2174cfa2f1a29a0b45bdfd /kernel | |
| parent | 0f4022a490ad68846062186f481defd53be69743 (diff) | |
| parent | 89529d8b8f8daf92d9979382b8d2eb39966846ea (diff) | |
Merge tag 'trace-v5.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes from Steven Rostedt:
- Have recordmcount check for valid st_shndx otherwise some archs may
have invalid references for the mcount location.
- Two fixes done for mapping pids to task names. Traces were not
showing the names of tasks when they should have.
- Fix to trace_clock_global() to prevent it from going backwards
* tag 'trace-v5.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Do no increment trace_clock_global() by one
tracing: Do not stop recording comms if the trace file is being read
tracing: Do not stop recording cmdlines when tracing is off
recordmcount: Correct st_shndx handling
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace.c | 11 | ||||
| -rw-r--r-- | kernel/trace/trace_clock.c | 6 |
2 files changed, 3 insertions, 14 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 9299057feb56..d23a09d3eb37 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2198,9 +2198,6 @@ struct saved_cmdlines_buffer { }; static struct saved_cmdlines_buffer *savedcmd; -/* temporary disable recording */ -static atomic_t trace_record_taskinfo_disabled __read_mostly; - static inline char *get_saved_cmdlines(int idx) { return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN]; @@ -2486,8 +2483,6 @@ static bool tracing_record_taskinfo_skip(int flags) { if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID)))) return true; - if (atomic_read(&trace_record_taskinfo_disabled) || !tracing_is_on()) - return true; if (!__this_cpu_read(trace_taskinfo_save)) return true; return false; @@ -3998,9 +3993,6 @@ static void *s_start(struct seq_file *m, loff_t *pos) return ERR_PTR(-EBUSY); #endif - if (!iter->snapshot) - atomic_inc(&trace_record_taskinfo_disabled); - if (*pos != iter->pos) { iter->ent = NULL; iter->cpu = 0; @@ -4043,9 +4035,6 @@ static void s_stop(struct seq_file *m, void *p) return; #endif - if (!iter->snapshot) - atomic_dec(&trace_record_taskinfo_disabled); - trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); } diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c index c1637f90c8a3..4702efb00ff2 100644 --- a/kernel/trace/trace_clock.c +++ b/kernel/trace/trace_clock.c @@ -115,9 +115,9 @@ u64 notrace trace_clock_global(void) prev_time = READ_ONCE(trace_clock_struct.prev_time); now = sched_clock_cpu(this_cpu); - /* Make sure that now is always greater than prev_time */ + /* Make sure that now is always greater than or equal to prev_time */ if ((s64)(now - prev_time) < 0) - now = prev_time + 1; + now = prev_time; /* * If in an NMI context then dont risk lockups and simply return @@ -131,7 +131,7 @@ u64 notrace trace_clock_global(void) /* Reread prev_time in case it was already updated */ prev_time = READ_ONCE(trace_clock_struct.prev_time); if ((s64)(now - prev_time) < 0) - now = prev_time + 1; + now = prev_time; trace_clock_struct.prev_time = now; |