On Sun, Jan 06, 2013 at 09:37:25PM +0100, Stephane Eranian wrote: > On Sat, Jan 5, 2013 at 7:43 PM, Jiri Olsa <jo...@redhat.com> wrote: > > On Thu, Dec 20, 2012 at 04:41:38PM +0100, Stephane Eranian wrote: > >> This patch adds support for memory profiling using the > >> PEBS Load Latency facility. > >> > >> Load accesses are sampled by HW and the instruction > >> address, data address, load latency, data source, tlb, > >> locked information can be saved in the sampling buffer > >> if using the PERF_SAMPLE_COST (for latency), > > > > PERF_SAMPLE_WEIGHT ? > > > No I switched to using Andi's PERF_SAMPLE_WEIGHT patch for this. > So it's PERF_SAMPLE_COST now.
Is it? I dont see PERF_SAMPLE_COST being used in the code.. > > >> PERF_SAMPLE_ADDR, PERF_SAMPLE_DSRC types. > >> > >> To enable PEBS Load Latency, users have to use the > >> model specific event: > >> - on NHM/WSM: MEM_INST_RETIRED:LATENCY_ABOVE_THRESHOLD > >> - on SNB/IVB: MEM_TRANS_RETIRED:LATENCY_ABOVE_THRESHOLD > >> > >> To make things easier, this patch also exports a generic > >> alias via sysfs: mem-loads. It export the right event > >> encoding based on the host CPU and can be used directly > >> by the perf tool. > >> > >> Loosely based on Intel's Lin Ming patch posted on LKML > >> in July 2011. > >> > >> Signed-off-by: Stephane Eranian <eran...@google.com> > > > > SNIP > > > >> +/* > >> + * Map PEBS Load Latency Data Source encodings to generic > >> + * memory data source information > >> + */ > >> +#define P(a, b) PERF_MEM_S(a, b) > >> +#define OP_LH (P(OP, LOAD) | P(LVL, HIT)) > >> +#define SNOOP_NONE_MISS (P(SNOOP, NONE) | P(SNOOP, MISS)) > >> + > > > > I checked Intel SDM 'Table 18-13. Data Source Encoding for Load Latency > > Record' > > and it seems to be different (below) at some points.. did you use another > > source? > > > Yeah, and the table is wrong in the SDM. What I have is correct and approved > by > Intel. Is there any public link? thanks, jirka -- 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/
