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SubjectRe: [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.
-
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