Re: [for-next-3.11][PATCH 4/4] tracing: Fix reset of time stamps during trace_clock changes
On Thu, Aug 08, 2013 at 12:12:06PM -0400, Steven Rostedt wrote: > Greg, > > I'm testing the backports, and I found that this patch depends on commit > 10246fa35d4ffdfe472185d4cbf9c2dfd9a9f023 "tracing: Use flag > buffer_disabled for irqsoff tracer" > > Please add that to 3.10 before applying this fix. Oops, I sent out the "FAILED" email before seeing this, sorry about that. I've applied this patch, and now the original one applies as well, thanks. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [for-next-3.11][PATCH 4/4] tracing: Fix reset of time stamps during trace_clock changes
Greg, I'm testing the backports, and I found that this patch depends on commit 10246fa35d4ffdfe472185d4cbf9c2dfd9a9f023 "tracing: Use flag buffer_disabled for irqsoff tracer" Please add that to 3.10 before applying this fix. Thanks! -- Steve On Sat, 2013-08-03 at 08:49 -0400, Steven Rostedt wrote: > plain text document attachment > (0004-tracing-Fix-reset-of-time-stamps-during-trace_clock-.patch) > From: Alexander Z Lam > > Fixed two issues with changing the timestamp clock with trace_clock: > > - The global buffer was reset on instance clock changes. Change this to pass >the correct per-instance buffer > - ftrace_now() is used to set buf->time_start in tracing_reset_online_cpus(). >This was incorrect because ftrace_now() used the global buffer's clock to >return the current time. Change this to use buffer_ftrace_now() which >returns the current time for the correct per-instance buffer. > > Also removed tracing_reset_current() because it is not used anywhere > > Link: > http://lkml.kernel.org/r/1375493777-17261-2-git-send-email-...@google.com > > Cc: Vaibhav Nagarnaik > Cc: David Sharp > Cc: Alexander Z Lam > Cc: sta...@vger.kernel.org # 3.10 > Signed-off-by: Alexander Z Lam > Signed-off-by: Steven Rostedt > --- > kernel/trace/trace.c | 24 > 1 file changed, 12 insertions(+), 12 deletions(-) > > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c > index 531c9e6..496f94d 100644 > --- a/kernel/trace/trace.c > +++ b/kernel/trace/trace.c > @@ -243,20 +243,25 @@ int filter_current_check_discard(struct ring_buffer > *buffer, > } > EXPORT_SYMBOL_GPL(filter_current_check_discard); > > -cycle_t ftrace_now(int cpu) > +cycle_t buffer_ftrace_now(struct trace_buffer *buf, int cpu) > { > u64 ts; > > /* Early boot up does not have a buffer yet */ > - if (!global_trace.trace_buffer.buffer) > + if (!buf->buffer) > return trace_clock_local(); > > - ts = ring_buffer_time_stamp(global_trace.trace_buffer.buffer, cpu); > - ring_buffer_normalize_time_stamp(global_trace.trace_buffer.buffer, cpu, > &ts); > + ts = ring_buffer_time_stamp(buf->buffer, cpu); > + ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); > > return ts; > } > > +cycle_t ftrace_now(int cpu) > +{ > + return buffer_ftrace_now(&global_trace.trace_buffer, cpu); > +} > + > /** > * tracing_is_enabled - Show if global_trace has been disabled > * > @@ -1211,7 +1216,7 @@ void tracing_reset_online_cpus(struct trace_buffer *buf) > /* Make sure all commits have finished */ > synchronize_sched(); > > - buf->time_start = ftrace_now(buf->cpu); > + buf->time_start = buffer_ftrace_now(buf, buf->cpu); > > for_each_online_cpu(cpu) > ring_buffer_reset_cpu(buffer, cpu); > @@ -1219,11 +1224,6 @@ void tracing_reset_online_cpus(struct trace_buffer > *buf) > ring_buffer_record_enable(buffer); > } > > -void tracing_reset_current(int cpu) > -{ > - tracing_reset(&global_trace.trace_buffer, cpu); > -} > - > /* Must have trace_types_lock held */ > void tracing_reset_all_online_cpus(void) > { > @@ -4634,12 +4634,12 @@ static ssize_t tracing_clock_write(struct file *filp, > const char __user *ubuf, >* New clock may not be consistent with the previous clock. >* Reset the buffer so that it doesn't have incomparable timestamps. >*/ > - tracing_reset_online_cpus(&global_trace.trace_buffer); > + tracing_reset_online_cpus(&tr->trace_buffer); > > #ifdef CONFIG_TRACER_MAX_TRACE > if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer) > ring_buffer_set_clock(tr->max_buffer.buffer, > trace_clocks[i].func); > - tracing_reset_online_cpus(&global_trace.max_buffer); > + tracing_reset_online_cpus(&tr->max_buffer); > #endif > > mutex_unlock(&trace_types_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[for-next-3.11][PATCH 4/4] tracing: Fix reset of time stamps during trace_clock changes
From: Alexander Z Lam Fixed two issues with changing the timestamp clock with trace_clock: - The global buffer was reset on instance clock changes. Change this to pass the correct per-instance buffer - ftrace_now() is used to set buf->time_start in tracing_reset_online_cpus(). This was incorrect because ftrace_now() used the global buffer's clock to return the current time. Change this to use buffer_ftrace_now() which returns the current time for the correct per-instance buffer. Also removed tracing_reset_current() because it is not used anywhere Link: http://lkml.kernel.org/r/1375493777-17261-2-git-send-email-...@google.com Cc: Vaibhav Nagarnaik Cc: David Sharp Cc: Alexander Z Lam Cc: sta...@vger.kernel.org # 3.10 Signed-off-by: Alexander Z Lam Signed-off-by: Steven Rostedt --- kernel/trace/trace.c | 24 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 531c9e6..496f94d 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -243,20 +243,25 @@ int filter_current_check_discard(struct ring_buffer *buffer, } EXPORT_SYMBOL_GPL(filter_current_check_discard); -cycle_t ftrace_now(int cpu) +cycle_t buffer_ftrace_now(struct trace_buffer *buf, int cpu) { u64 ts; /* Early boot up does not have a buffer yet */ - if (!global_trace.trace_buffer.buffer) + if (!buf->buffer) return trace_clock_local(); - ts = ring_buffer_time_stamp(global_trace.trace_buffer.buffer, cpu); - ring_buffer_normalize_time_stamp(global_trace.trace_buffer.buffer, cpu, &ts); + ts = ring_buffer_time_stamp(buf->buffer, cpu); + ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); return ts; } +cycle_t ftrace_now(int cpu) +{ + return buffer_ftrace_now(&global_trace.trace_buffer, cpu); +} + /** * tracing_is_enabled - Show if global_trace has been disabled * @@ -1211,7 +1216,7 @@ void tracing_reset_online_cpus(struct trace_buffer *buf) /* Make sure all commits have finished */ synchronize_sched(); - buf->time_start = ftrace_now(buf->cpu); + buf->time_start = buffer_ftrace_now(buf, buf->cpu); for_each_online_cpu(cpu) ring_buffer_reset_cpu(buffer, cpu); @@ -1219,11 +1224,6 @@ void tracing_reset_online_cpus(struct trace_buffer *buf) ring_buffer_record_enable(buffer); } -void tracing_reset_current(int cpu) -{ - tracing_reset(&global_trace.trace_buffer, cpu); -} - /* Must have trace_types_lock held */ void tracing_reset_all_online_cpus(void) { @@ -4634,12 +4634,12 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, * New clock may not be consistent with the previous clock. * Reset the buffer so that it doesn't have incomparable timestamps. */ - tracing_reset_online_cpus(&global_trace.trace_buffer); + tracing_reset_online_cpus(&tr->trace_buffer); #ifdef CONFIG_TRACER_MAX_TRACE if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer) ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); - tracing_reset_online_cpus(&global_trace.max_buffer); + tracing_reset_online_cpus(&tr->max_buffer); #endif mutex_unlock(&trace_types_lock); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/