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| author | Mel Gorman <mel@csn.ul.ie> | 2007-10-24 18:23:50 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-24 18:23:50 +0200 |
| commit | b3da2a73ff5a2953a4ad8ebbf0aa7e6965ff9de2 (patch) | |
| tree | 43583e5f492a48c56f9537006c8f806d570b0d84 | |
| parent | sched: use show_regs() to improve __schedule_bug() output (diff) | |
| download | linux-b3da2a73ff5a2953a4ad8ebbf0aa7e6965ff9de2.tar.xz linux-b3da2a73ff5a2953a4ad8ebbf0aa7e6965ff9de2.zip | |
sched: document profile=sleep requiring CONFIG_SCHEDSTATS
profile=sleep only works if CONFIG_SCHEDSTATS is set. This patch notes
the limitation in Documentation/kernel-parameters.txt and prints a
warning at boot-time if profile=sleep is used without CONFIG_SCHEDSTAT.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | kernel/profile.c | 5 |
2 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a13d69b2217d..8ae5fac08dfa 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1444,7 +1444,8 @@ and is between 256 and 4096 characters. It is defined in the file Param: "schedule" - profile schedule points. Param: <number> - step/bucket size as a power of 2 for statistical time based profiling. - Param: "sleep" - profile D-state sleeping (millisecs) + Param: "sleep" - profile D-state sleeping (millisecs). + Requires CONFIG_SCHEDSTATS Param: "kvm" - profile VM exits. processor.max_cstate= [HW,ACPI] diff --git a/kernel/profile.c b/kernel/profile.c index 631b75c25d7e..5e95330e5120 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -60,6 +60,7 @@ static int __init profile_setup(char * str) int par; if (!strncmp(str, sleepstr, strlen(sleepstr))) { +#ifdef CONFIG_SCHEDSTATS prof_on = SLEEP_PROFILING; if (str[strlen(sleepstr)] == ',') str += strlen(sleepstr) + 1; @@ -68,6 +69,10 @@ static int __init profile_setup(char * str) printk(KERN_INFO "kernel sleep profiling enabled (shift: %ld)\n", prof_shift); +#else + printk(KERN_WARNING + "kernel sleep profiling requires CONFIG_SCHEDSTATS\n"); +#endif /* CONFIG_SCHEDSTATS */ } else if (!strncmp(str, schedstr, strlen(schedstr))) { prof_on = SCHED_PROFILING; if (str[strlen(schedstr)] == ',') |