Arnaldo, So I just checked perf top and those 2 options are doing user level filtering of the samples. This is different from what I want which is hardware level filtering if avail.
On Wed, Aug 28, 2013 at 3:38 PM, Stephane Eranian <eran...@google.com> wrote: > On Wed, Aug 28, 2013 at 3:27 PM, Arnaldo Carvalho de Melo > <a...@redhat.com> wrote: >> Em Mon, Aug 26, 2013 at 04:21:44PM -0600, David Ahern escreveu: >>> On 8/26/13 7:11 AM, Stephane Eranian wrote: >> >>> >This patch adds the -u -and -k options to perf to allow >>> >filtering of load/store sampling based on priv levels. >>> >This may not be supported by all HW platforms. >> >> >>> >+++ b/tools/perf/Documentation/perf-mem.txt >>> >+-k:: >>> >+ Only sample loads/stores at the user level (default: user + kernel) >>> >+-u:: >>> >+ Only sample loads/stores at the kernel level (default: user + kernel) >> >>> Are the descriptions backwards? In the commit message yuo have -u >>> means user level and -k means kernel level; the help message here >>> seems backwards. >> >> Looks like it is reversed, yes. >> >>> >+ OPT_BOOLEAN('u', "user-level", &mem.user, "include user-level >>> >accesses"), >>> >+ OPT_BOOLEAN('k', "kernel-level", &mem.kernel, "include kernel-level >>> >accesses"), >> >> And its not clear to say that using -u will _exclude_ kernel samples, >> just that it includes user samples, perf top has: >> >> -K, --hide_kernel_symbols hide kernel symbols >> -U, --hide_user_symbols hide user symbols >> >> So perhaps we should change both to (and add this to 'report' as well): >> >> -U, --hide_kernel_symbols hide kernel symbols >> -K, --hide_user_symbols hide user symbols >> > > Well, I don't know what perf top does here but I don't want to hide > the samples. I simply don't want to collect them (do not appear > in the perf.data file). If that's what is happening in perf top, then > I'll be glad to use the same options. > > >> To state that: >> >> perf top -K >> and >> perf top --hide_user_symbols >> >> Are equivalent and asks for 'kernel only' samples, like it seems its the >> intent (filtering) of Stephane here, and seems to clarify things? >> >> - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/