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| author | Thomas Renninger <trenn@suse.de> | 2011-02-28 22:06:34 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-03-15 00:43:18 +0100 |
| commit | f9b9e806ae0ede772cbb9916d9ac7354a123d044 (patch) | |
| tree | c855475a3b19f829999f585054e69e35af55655d /kernel/sys.c | |
| parent | 7ae496187876d264c712d7c102c45edb8eb41363 (diff) | |
PM QoS: Make pm_qos settings readable
I have a machine where entering deep C-states broke.
pm_qos was a hot candidate, but I couldn't find any way to double
check without the need of recompiling.
While in this case it was a driver bug (ath9k):
https://bugzilla.kernel.org/show_bug.cgi?id=27532
powertop or others may want to read out cpu_dma_latency
restrictions which could be the cause of preventing a machine
entering deeper C-states.
Output with this patch:
# default value of 2000 * USEC_PER_SEC (0x77359400)
cat /dev/network_latency |hexdump
0000000 9400 7735
0000004
# value of 55 us which is the reason for not entering C2
cat /dev/cpu_dma_latency |hexdump
0000000 0037 0000
0000004
There is no reason to hide this info -> make pm_qos files readable.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'kernel/sys.c')
0 files changed, 0 insertions, 0 deletions