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Commit b3da2a73 authored by Mel Gorman's avatar Mel Gorman Committed by Ingo Molnar
Browse files

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: default avatarMel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 838225b4

Documentation/kernel-parameters.txt

+2 −1
Original line number Diff line number Diff line
@@ -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]

kernel/profile.c

+5 −0
Original line number Diff line number Diff line
@@ -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)] == ',')