summaryrefslogtreecommitdiff
path: root/tools/power
diff options
context:
space:
mode:
authorLen Brown <len.brown@intel.com>2017-03-04 15:42:48 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-08 10:26:11 +0200
commit86c469bea4ae129433d119b7eb178d40421db045 (patch)
tree421960515eb0a32def2acfb3c34a4abb90156944 /tools/power
parentc126bc6b94ddbc94af3382e31eeb927e7d6bc533 (diff)
tools/power turbostat: bugfix: GFXMHz column not changing
[ Upstream commit 22048c5485503749754b3b5daf9d99ef89fcacdc ] turbostat displays a GFXMHz column, which comes from reading /sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz But GFXMHz was not changing, even when a manual cat /sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz showed a new value. It turns out that a rewind() on the open file is not sufficient, fflush() (or a close/open) is needed to read fresh values. Reported-by: Yaroslav Isakov <yaroslav.isakov@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/power')
-rw-r--r--tools/power/x86/turbostat/turbostat.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 3e199b508a96..9664b1ff4285 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2003,8 +2003,10 @@ int snapshot_gfx_mhz(void)
if (fp == NULL)
fp = fopen_or_die("/sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz", "r");
- else
+ else {
rewind(fp);
+ fflush(fp);
+ }
retval = fscanf(fp, "%d", &gfx_cur_mhz);
if (retval != 1)