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authorThomas Renninger <trenn@suse.de>2009-02-03 19:17:41 -0500
committerDave Jones <davej@redhat.com>2009-02-24 22:47:31 -0500
commited12978453a3845c947695e7ad32bb3ede444813 (patch)
tree6fcec1eaa023fd2cadce8e82a17b9b890f59fd88 /drivers/cpufreq/cpufreq.c
parent0e64a0c982c06a6b8f5e2a7f29eb108fdf257b2f (diff)
[CPUFREQ] Introduce /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_transition_latency
It's not only useful for the ondemand and conservative governors, but also for userspace daemons to know about the HW transition latency of the CPU. It is especially useful for userspace to know about this value when the ondemand or conservative governors are run. The sampling rate control value depends on it and for userspace being able to set sane tuning values there it has to know about the transition latency. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
-rw-r--r--drivers/cpufreq/cpufreq.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 1867dac35aff..6fe466efb0b5 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -452,6 +452,7 @@ static ssize_t show_##file_name \
452 452
453show_one(cpuinfo_min_freq, cpuinfo.min_freq); 453show_one(cpuinfo_min_freq, cpuinfo.min_freq);
454show_one(cpuinfo_max_freq, cpuinfo.max_freq); 454show_one(cpuinfo_max_freq, cpuinfo.max_freq);
455show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
455show_one(scaling_min_freq, min); 456show_one(scaling_min_freq, min);
456show_one(scaling_max_freq, max); 457show_one(scaling_max_freq, max);
457show_one(scaling_cur_freq, cur); 458show_one(scaling_cur_freq, cur);
@@ -659,6 +660,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
659define_one_ro0400(cpuinfo_cur_freq); 660define_one_ro0400(cpuinfo_cur_freq);
660define_one_ro(cpuinfo_min_freq); 661define_one_ro(cpuinfo_min_freq);
661define_one_ro(cpuinfo_max_freq); 662define_one_ro(cpuinfo_max_freq);
663define_one_ro(cpuinfo_transition_latency);
662define_one_ro(scaling_available_governors); 664define_one_ro(scaling_available_governors);
663define_one_ro(scaling_driver); 665define_one_ro(scaling_driver);
664define_one_ro(scaling_cur_freq); 666define_one_ro(scaling_cur_freq);
@@ -672,6 +674,7 @@ define_one_rw(scaling_setspeed);
672static struct attribute *default_attrs[] = { 674static struct attribute *default_attrs[] = {
673 &cpuinfo_min_freq.attr, 675 &cpuinfo_min_freq.attr,
674 &cpuinfo_max_freq.attr, 676 &cpuinfo_max_freq.attr,
677 &cpuinfo_transition_latency.attr,
675 &scaling_min_freq.attr, 678 &scaling_min_freq.attr,
676 &scaling_max_freq.attr, 679 &scaling_max_freq.attr,
677 &affected_cpus.attr, 680 &affected_cpus.attr,