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tools/power turbostat: bugfix: GFXMHz column not changing

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>
lynxis/untested/v4.19.128
Len Brown 5 years ago
parent
commit
22048c5485
  1. 4
      tools/power/x86/turbostat/turbostat.c

4
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)

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