Messages in this thread | | | Date | Thu, 25 Oct 2007 16:37:43 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] Better document profile= |
| |
On Tue, 16 Oct 2007 22:16:47 -0700 "Russ Dill" <russ.dill@gmail.com> wrote:
> Be more explicit on what the step/bucket size accomplishes. > > Signed-off-by: Russ Dill <Russ.Dill@gmail.com> > --- > Documentation/kernel-parameters.txt | 5 ++++- > 1 files changed, 4 insertions(+), 1 deletions(-) > > diff --git a/Documentation/kernel-parameters.txt > b/Documentation/kernel-parameters.txt > index eb24799..3c6fd27 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -1427,7 +1427,10 @@ and is between 256 and 4096 characters. It is > defined in the file
Your email client is wordwrapping the patches.
> Format: [schedule,]<number> > Param: "schedule" - profile schedule points. > Param: <number> - step/bucket size as a power of 2 for > - statistical time based profiling. > + statistical time based profiling. A value of > + 2 will provide a granularity of 4 bytes, a > + value of 3 will provide a granularity of 8 > + bytes and so on. > Param: "sleep" - profile D-state sleeping (millisecs)
Actually the prof_shift isn't in units of bytes: it is in units of sizeof(unsigned long).
So on a 64-bit kernel, prof_shift=2 will give a granularity of 8<<2 bytes and on a 32-bit kernel, prof_shift=3 will give a granularity of 4<<3 bytes. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |