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authorPeter Zijlstra <peterz@infradead.org>2013-10-04 17:28:26 +0200
committerIngo Molnar <mingo@kernel.org>2013-11-11 12:43:39 +0100
commite5137b50a0640009fd63a3e65c14bc6e1be8796a (patch)
treeef8475a7281a78d7ad7bd6694b44c8a32c12f970 /Documentation/trace/ftrace.txt
parentstop_machine: Fix race between stop_two_cpus() and stop_cpus() (diff)
downloadlinux-e5137b50a0640009fd63a3e65c14bc6e1be8796a.tar.xz
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ftrace, sched: Add TRACE_FLAG_PREEMPT_RESCHED
Since the introduction of PREEMPT_NEED_RESCHED in: f27dde8deef3 ("sched: Add NEED_RESCHED to the preempt_count") we need to be able to look at both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED to understand the full preemption behaviour. Add it to the trace output. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Yuanhan Liu <yuanhan.liu@linux.intel.com> Link: http://lkml.kernel.org/r/20131004152826.GP3081@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/trace/ftrace.txt')
-rw-r--r--Documentation/trace/ftrace.txt6
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index ea2d35d64d26..bd365988e8d8 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -655,7 +655,11 @@ explains which is which.
read the irq flags variable, an 'X' will always
be printed here.
- need-resched: 'N' task need_resched is set, '.' otherwise.
+ need-resched:
+ 'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED is set,
+ 'n' only TIF_NEED_RESCHED is set,
+ 'p' only PREEMPT_NEED_RESCHED is set,
+ '.' otherwise.
hardirq/softirq:
'H' - hard irq occurred inside a softirq.