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authorMel Gorman <mel@csn.ul.ie>2007-10-24 18:23:50 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-24 18:23:50 +0200
commitb3da2a73ff5a2953a4ad8ebbf0aa7e6965ff9de2 (patch)
tree43583e5f492a48c56f9537006c8f806d570b0d84 /kernel/profile.c
parent838225b48edc971620cbeb292034dabd2b0d7d1d (diff)
downloadlwn-b3da2a73ff5a2953a4ad8ebbf0aa7e6965ff9de2.tar.gz
lwn-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>
Diffstat (limited to 'kernel/profile.c')
-rw-r--r--kernel/profile.c5
1 files changed, 5 insertions, 0 deletions
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)] == ',')