linux-kernel - RE: [PATCH] tools/power/turbostat: Fix uncore frequency file string

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Date: Tue, 2 Apr 2024 18:57:20 +0000
From: "Ernst, Justin" <justin.ernst@....com>
To: Len Brown <lenb@...nel.org>
CC: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] tools/power/turbostat: Fix uncore frequency file string

> From: Len Brown <lenb@...nel.org>
> Sent: Tuesday, April 2, 2024 12:46 PM
> 
> Thanks for the patch, Justin,
> 
> Looks like the probe part of this was already fixed in my git tree, so
> I lopped off that hunk and kept your 1st hunk.
> 
> Let me know if it works, or if I screwed it up.

It works! I tested on a 16-socket system with "..., package_10_die_00/, package_11_die_00/, etc" directories present.

Thanks for the link to your latest tree. It made it very easy to build and test your patch.

Cheers,
-Justin

> 
> latest is in this tree:
> https://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux.git/
> 
> thanks,
> -Len
> 
> On Fri, Mar 8, 2024 at 3:50 PM Justin Ernst <justin.ernst@....com> wrote:
> >
> > Running turbostat on a 16 socket HPE Scale-up Compute 3200 (SapphireRapids) fails with:
> > turbostat: /sys/devices/system/cpu/intel_uncore_frequency/package_010_die_00/current_freq_khz: open
> failed: No such file or directory
> >
> > We observe the sysfs uncore frequency directories named:
> > ...
> > package_09_die_00/
> > package_10_die_00/
> > package_11_die_00/
> > ...
> > package_15_die_00/
> >
> > The culprit is an incorrect sprintf format string "package_0%d_die_0%d" used
> > with each instance of reading uncore frequency files. uncore-frequency-common.c
> > creates the sysfs directory with the format "package_%02d_die_%02d". Once the
> > package value reaches double digits, the formats diverge.
> >
> > Change each instance of "package_0%d_die_0%d" to "package_%02d_die_%02d".
> >
> > Signed-off-by: Justin Ernst <justin.ernst@....com>
> > ---
> >  tools/power/x86/turbostat/turbostat.c | 10 +++++-----
> >  1 file changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
> > index 7a334377f92b..2a15a23cb726 100644
> > --- a/tools/power/x86/turbostat/turbostat.c
> > +++ b/tools/power/x86/turbostat/turbostat.c
> > @@ -2599,7 +2599,7 @@ unsigned long long get_uncore_mhz(int package, int die)
> >  {
> >         char path[128];
> >
> > -       sprintf(path,
> "/sys/devices/system/cpu/intel_uncore_frequency/package_0%d_die_0%d/current_freq_khz", package,
> > +       sprintf(path,
> "/sys/devices/system/cpu/intel_uncore_frequency/package_%02d_die_%02d/current_freq_khz", package,
> >                 die);
> >
> >         return (snapshot_sysfs_counter(path) / 1000);
> > @@ -4589,20 +4589,20 @@ static void probe_intel_uncore_frequency(void)
> >                 for (j = 0; j < topo.num_die; ++j) {
> >                         int k, l;
> >
> > -                       sprintf(path,
> "/sys/devices/system/cpu/intel_uncore_frequency/package_0%d_die_0%d/min_freq_khz",
> > +                       sprintf(path,
> "/sys/devices/system/cpu/intel_uncore_frequency/package_%02d_die_%02d/min_freq_khz",
> >                                 i, j);
> >                         k = read_sysfs_int(path);
> > -                       sprintf(path,
> "/sys/devices/system/cpu/intel_uncore_frequency/package_0%d_die_0%d/max_freq_khz",
> > +                       sprintf(path,
> "/sys/devices/system/cpu/intel_uncore_frequency/package_%02d_die_%02d/max_freq_khz",
> >                                 i, j);
> >                         l = read_sysfs_int(path);
> >                         fprintf(outf, "Uncore Frequency pkg%d die%d: %d - %d MHz ", i, j, k / 1000,
> l / 1000);
> >
> >                         sprintf(path,
> > -
> "/sys/devices/system/cpu/intel_uncore_frequency/package_0%d_die_0%d/initial_min_freq_khz",
> > +
> "/sys/devices/system/cpu/intel_uncore_frequency/package_%02d_die_%02d/initial_min_freq_khz",
> >                                 i, j);
> >                         k = read_sysfs_int(path);
> >                         sprintf(path,
> > -
> "/sys/devices/system/cpu/intel_uncore_frequency/package_0%d_die_0%d/initial_max_freq_khz",
> > +
> "/sys/devices/system/cpu/intel_uncore_frequency/package_%02d_die_%02d/initial_max_freq_khz",
> >                                 i, j);
> >                         l = read_sysfs_int(path);
> >                         fprintf(outf, "(%d - %d MHz)\n", k / 1000, l / 1000);
> > --
> > 2.26.2
> >
> 
> 
> --
> Len Brown, Intel