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 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/