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| author | Len Brown <len.brown@intel.com> | 2017-03-04 20:42:48 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-08 08:26:11 (GMT) |
| commit | 86c469bea4ae129433d119b7eb178d40421db045 (patch) | |
| tree | 421960515eb0a32def2acfb3c34a4abb90156944 /tools/power | |
| parent | c126bc6b94ddbc94af3382e31eeb927e7d6bc533 (diff) | |
| download | linux-86c469bea4ae129433d119b7eb178d40421db045.tar.xz | |
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.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 3e199b5..9664b1f 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) |