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sched: Update normalized values on user updates via proc

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The normalized values are also recalculated in case the scaling factor
changes.

This patch updates the internally used scheduler tuning values that are
normalized to one cpu in case a user sets new values via sysfs.

Together with patch 2 of this series this allows to let user configured
values scale (or not) to cpu add/remove events taking place later.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1259579808-11357-4-git-send-email-ehrhardt@linux.vnet.ibm.com>
[ v2: fix warning ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Christian Ehrhardt 2009-11-30 12:16:48 +01:00 • committed by Ingo Molnar
parent 1983a922a1
commit acb4a848da
3 changed files with 29 additions and 8 deletions
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14
kernel/sysctl.c
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@ -253,6 +253,8 @@ static int min_wakeup_granularity_ns; /* 0 usecs */
static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
static int min_sched_shares_ratelimit = 100000; /* 100 usec */
static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
#endif
static struct ctl_table kern_table[] = {
@ -271,7 +273,7 @@ static struct ctl_table kern_table[] = {
.data = &sysctl_sched_min_granularity,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &sched_nr_latency_handler,
.proc_handler = &sched_proc_update_handler,
.strategy = &sysctl_intvec,
.extra1 = &min_sched_granularity_ns,
.extra2 = &max_sched_granularity_ns,
@ -282,7 +284,7 @@ static struct ctl_table kern_table[] = {
.data = &sysctl_sched_latency,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &sched_nr_latency_handler,
.proc_handler = &sched_proc_update_handler,
.strategy = &sysctl_intvec,
.extra1 = &min_sched_granularity_ns,
.extra2 = &max_sched_granularity_ns,
@ -293,7 +295,7 @@ static struct ctl_table kern_table[] = {
.data = &sysctl_sched_wakeup_granularity,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.proc_handler = &sched_proc_update_handler,
.strategy = &sysctl_intvec,
.extra1 = &min_wakeup_granularity_ns,
.extra2 = &max_wakeup_granularity_ns,
@ -304,7 +306,9 @@ static struct ctl_table kern_table[] = {
.data = &sysctl_sched_shares_ratelimit,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.proc_handler = &sched_proc_update_handler,
.extra1 = &min_sched_shares_ratelimit,
.extra2 = &max_sched_shares_ratelimit,
},
{
.ctl_name = CTL_UNNUMBERED,
@ -312,7 +316,7 @@ static struct ctl_table kern_table[] = {
.data = &sysctl_sched_tunable_scaling,
.maxlen = sizeof(enum sched_tunable_scaling),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.proc_handler = &sched_proc_update_handler,
.strategy = &sysctl_intvec,
.extra1 = &min_sched_tunable_scaling,
.extra2 = &max_sched_tunable_scaling,