Messages in this thread Patch in this message | | | From | Len Brown <> | Subject | [PATCH 1/7] tools/power turbostat: bugfix: GFXMHz column not changing | Date | Wed, 12 Apr 2017 20:08:47 -0400 |
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From: Len Brown <len.brown@intel.com>
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> --- tools/power/x86/turbostat/turbostat.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 828dccd3f01e..d7fb6bcb2744 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -2485,8 +2485,10 @@ 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) -- 2.11.0.161.g6610af872
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