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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 /arch | |
parent | 326587b840785c60f5dc18557235a23bafefd620 (diff) | |
download | linux-9745512ce79de686df354dc70a8d1a74d801892d.tar.gz linux-9745512ce79de686df354dc70a8d1a74d801892d.tar.bz2 linux-9745512ce79de686df354dc70a8d1a74d801892d.zip |
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 'arch')
-rw-r--r-- | arch/x86/kernel/stacktrace.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 6fa6cf036c70..55771fd7e545 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -33,6 +33,19 @@ static void save_stack_address(void *data, unsigned long addr) trace->entries[trace->nr_entries++] = addr; } +static void save_stack_address_nosched(void *data, unsigned long addr) +{ + struct stack_trace *trace = (struct stack_trace *)data; + if (in_sched_functions(addr)) + return; + if (trace->skip > 0) { + trace->skip--; + return; + } + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = addr; +} + static const struct stacktrace_ops save_stack_ops = { .warning = save_stack_warning, .warning_symbol = save_stack_warning_symbol, @@ -40,6 +53,13 @@ static const struct stacktrace_ops save_stack_ops = { .address = save_stack_address, }; +static const struct stacktrace_ops save_stack_ops_nosched = { + .warning = save_stack_warning, + .warning_symbol = save_stack_warning_symbol, + .stack = save_stack_stack, + .address = save_stack_address_nosched, +}; + /* * Save stack-backtrace addresses into a stack_trace buffer. */ @@ -50,3 +70,10 @@ void save_stack_trace(struct stack_trace *trace) trace->entries[trace->nr_entries++] = ULONG_MAX; } EXPORT_SYMBOL(save_stack_trace); + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + dump_trace(tsk, NULL, NULL, &save_stack_ops_nosched, trace); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} |