On 07/23/2015 07:12 PM, Vince Weaver wrote: > > This manpage patch relates to the addition of the AUX mmap region > as added in the following commit:
Thanks, Vince. Applied. Cheers, Michael > commit 45bfb2e50471abbbfd83d40d28c986078b0d24ff > Author: Peter Zijlstra <[email protected]> > > perf: Add AUX area to ring buffer for raw data streams > > Signed-off-by: Peter Zijlstra (Intel) <[email protected]> > Acked-by: Alexander Shishkin <[email protected]> > Cc: Borislav Petkov <[email protected]> > Cc: Frederic Weisbecker <[email protected]> > Cc: H. Peter Anvin <[email protected]> > Cc: Kaixu Xia <[email protected]> > Cc: Linus Torvalds <[email protected]> > Cc: Mike Galbraith <[email protected]> > Cc: Paul Mackerras <[email protected]> > Cc: Robert Richter <[email protected]> > Cc: Stephane Eranian <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: [email protected] > Cc: [email protected] > Cc: [email protected] > Cc: [email protected] > Cc: [email protected] > Link: > http://lkml.kernel.org/r/1421237903-181015-3-git-send-email-alexander.shish...@linux.intel.com > Signed-off-by: Ingo Molnar <[email protected]> > > > > Signed-off-by: Vince Weaver <[email protected]> > > diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 > index a3bebaa..bd6c4c9 100644 > --- a/man2/perf_event_open.2 > +++ b/man2/perf_event_open.2 > @@ -1416,6 +1416,10 @@ struct perf_event_mmap_page { > __u64 data_tail; /* user-space written tail */ > __u64 data_offset; /* where the buffer starts */ > __u64 data_size; /* data buffer size */ > + __u64 aux_head; > + __u64 aux_tail; > + __u64 aux_offset; > + __u64 aux_size; > > } > .fi > @@ -1643,6 +1647,34 @@ where perf sample data begins. > .\" commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f > Contains the size of the perf sample region within > the mmap buffer. > +.TP > +.IR aux_head ", " aux_tail ", " aux_offset ", " aux_size " (since Linux 4.1) > +.\" commit 45bfb2e50471abbbfd83d40d28c986078b0d24ff > +The AUX region allows mmaping a separate sample buffer for high > +bandwidth data streams (separate from the main perf sample buffer). > +An example of a high bandwidth stream is instruction tracing support, > +as is found in newer Intel processors. > + > +To set up an AUX area, first > +.I aux_offset > +needs to be set with an offset greater than > +.IR data_offset + data_size > +and > +.I aux_size > +needs to be set to the desired buffer size. > +The desired offset and size must be page aligned, and the size > +must be a power of two. > +These values are then passed to mmap in order to map the AUX buffer. > +Pages in the AUX buffer are included as part of the user mlock > +rlimit as well as the > +.I perf_event_mlock_kb > +allowance. > + > +The > +.IR aux_head " and " aux_tail > +ring buffer pointers have the same behavior and ordering > +rules as the previous described > +.IR data_head " and " data_tail . > .PP > The following 2^n ring-buffer pages have the layout described below. > > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
