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Message-ID: <585535bf-47d0-178c-706a-3d71bfc31f68@amd.com> Date: Thu, 6 Oct 2022 17:08:55 +0530 From: Ravi Bangoria <ravi.bangoria@....com> To: "Liang, Kan" <kan.liang@...ux.intel.com>, peterz@...radead.org, acme@...nel.org Cc: jolsa@...nel.org, namhyung@...nel.org, eranian@...gle.com, irogers@...gle.com, jmario@...hat.com, leo.yan@...aro.org, alisaidi@...zon.com, ak@...ux.intel.com, dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com, mark.rutland@....com, alexander.shishkin@...ux.intel.com, tglx@...utronix.de, bp@...en8.de, x86@...nel.org, linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, sandipan.das@....com, ananth.narayan@....com, kim.phillips@....com, santosh.shukla@....com, kajoljain <kjain@...ux.ibm.com>, Ravi Bangoria <ravi.bangoria@....com> Subject: Re: [PATCH v3 01/15] perf/mem: Introduce PERF_MEM_LVLNUM_{EXTN_MEM|IO} On 03-Oct-22 6:45 PM, Liang, Kan wrote: > > > On 2022-10-01 2:37 a.m., Ravi Bangoria wrote: >> On 30-Sep-22 7:47 PM, Liang, Kan wrote: >>> >>> >>> On 2022-09-30 8:50 a.m., Ravi Bangoria wrote: >>>> On 30-Sep-22 4:18 PM, kajoljain wrote: >>>>> >>>>> >>>>> On 9/28/22 15:27, Ravi Bangoria wrote: >>>>>> PERF_MEM_LVLNUM_EXTN_MEM which can be used to indicate accesses to >>>>>> extension memory like CXL etc. PERF_MEM_LVL_IO can be used for IO >>>>>> accesses but it can not distinguish between local and remote IO. >>>>>> Introduce new field PERF_MEM_LVLNUM_IO which can be clubbed with >>>>>> PERF_MEM_REMOTE_REMOTE to indicate Remote IO accesses. >>>>>> >>>>>> Signed-off-by: Ravi Bangoria <ravi.bangoria@....com> >>>>>> --- >>>>>> include/uapi/linux/perf_event.h | 4 +++- >>>>>> 1 file changed, 3 insertions(+), 1 deletion(-) >>>>>> >>>>>> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h >>>>>> index e639c74cf5fb..4ae3c249f675 100644 >>>>>> --- a/include/uapi/linux/perf_event.h >>>>>> +++ b/include/uapi/linux/perf_event.h >>>>>> @@ -1336,7 +1336,9 @@ union perf_mem_data_src { >>>>>> #define PERF_MEM_LVLNUM_L2 0x02 /* L2 */ >>>>>> #define PERF_MEM_LVLNUM_L3 0x03 /* L3 */ >>>>>> #define PERF_MEM_LVLNUM_L4 0x04 /* L4 */ >>>>>> -/* 5-0xa available */ >>>>>> +/* 5-0x8 available */ >>>>>> +#define PERF_MEM_LVLNUM_EXTN_MEM 0x09 /* Extension memory */ >>>>> >>>>> Hi Ravi, >>>>> Here we are adding entry explicitly for accesses to Extension memory >>>>> like CXL. In future if we want to extend it for cache or other accesses >>>>> , we again need to add new entries. >>>>> Can we rather add single entry say PERF_MEM_LVLNUM_EXTN and further can >>>>> use reserved bits to specify memory/cache? >>>> >>>> Is everybody okay with this: >>>> >>>> #define PERF_MEM_LVLNUM_EXTN 0x09 /* CXL */ >>> >>> I think a generic name, PERF_MEM_LVLNUM_EXTN, only make sense, when it >>> wants to include all the types of the Extension memory, e.g., CXL, PMEM, >>> HBM, etc. Then we can set this bit and the corresponding CXL bits to >>> understand the real source. Is it the case here? >>> >>> But if it's only for the CXL, I think it's better to use a dedicated >>> name, PERF_MEM_LVLNUM_CXL. (as we did for PMEM, PERF_MEM_LVLNUM_PMEM). >>> If so, I don't think we need the PERF_MEM_EXTN_CXL_ANY. >> >> Ok. For now, I think below is good enough? Later we can introduce new >> variable to provide type of cxl device. >> >> >> From 5deb2055e2b5b0a61403f2d5f4e5a784b14a65e3 Mon Sep 17 00:00:00 2001 >> From: Ravi Bangoria <ravi.bangoria@....com> >> Date: Sat, 1 Oct 2022 11:37:05 +0530 >> Subject: [PATCH] perf/mem: Rename PERF_MEM_LVLNUM_EXTN_MEM to >> PERF_MEM_LVLNUM_CXL >> >> PERF_MEM_LVLNUM_EXTN_MEM was introduced to cover CXL devices but it's >> bit ambiguous name and also not generic enough to cover cxl.cache and >> cxl.io devices. Rename it to PERF_MEM_LVLNUM_CXL to be more specific. > > Looks good to me. > > Reviewed-by: Kan Liang <kan.liang@...ux.intel.com> Thanks Kan. Peter, can you please include this patch along with the series? Arnaldo, I'll respin tool side of patches with this change. Thanks, Ravi
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