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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Apr 2025 04:00:38.5500 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c0162844-4d57-4c1f-daa1-08dd86d26705 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000010.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB9494 Content-Type: text/plain; charset="utf-8" IBS OP PMU on Zen5 supports Load Latency filtering. Decode and dump Load Latency filtering related bits into perf script raw dump. Also add oneliner example in the perf-amd-ibs man page. Signed-off-by: Ravi Bangoria --- tools/perf/Documentation/perf-amd-ibs.txt | 9 +++++++++ tools/perf/util/amd-sample-raw.c | 14 ++++++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/tools/perf/Documentation/perf-amd-ibs.txt b/tools/perf/Documen= tation/perf-amd-ibs.txt index 2fd31d9d7b71..55f80beae037 100644 --- a/tools/perf/Documentation/perf-amd-ibs.txt +++ b/tools/perf/Documentation/perf-amd-ibs.txt @@ -85,6 +85,15 @@ System-wide profile, uOps event, sampling period: 100000= , L3MissOnly (Zen4 onwar =20 # perf record -e ibs_op/cnt_ctl=3D1,l3missonly=3D1/ -c 100000 -a =20 +System-wide profile, cycles event, sampling period: 100000, LdLat filterin= g (Zen5 +onward) + + # perf record -e ibs_op/ldlat=3D128/ -c 100000 -a + + Supported load latency threshold values are 128 to 2048 (both inclusive). + Latency value which is a multiple of 128 incurs a little less profiling + overhead compared to other values. + Per process(upstream v6.2 onward), uOps event, sampling period: 100000 =20 # perf record -e ibs_op/cnt_ctl=3D1/ -c 100000 -p 1234 diff --git a/tools/perf/util/amd-sample-raw.c b/tools/perf/util/amd-sample-= raw.c index 9d0ce88e90e4..ac34b18ccc0c 100644 --- a/tools/perf/util/amd-sample-raw.c +++ b/tools/perf/util/amd-sample-raw.c @@ -19,6 +19,7 @@ =20 static u32 cpu_family, cpu_model, ibs_fetch_type, ibs_op_type; static bool zen4_ibs_extensions; +static bool ldlat_cap; =20 static void pr_ibs_fetch_ctl(union ibs_fetch_ctl reg) { @@ -78,14 +79,20 @@ static void pr_ic_ibs_extd_ctl(union ic_ibs_extd_ctl re= g) static void pr_ibs_op_ctl(union ibs_op_ctl reg) { char l3_miss_only[sizeof(" L3MissOnly _")] =3D ""; + char ldlat[sizeof(" LdLatThrsh __ LdLatEn _")] =3D ""; =20 if (zen4_ibs_extensions) snprintf(l3_miss_only, sizeof(l3_miss_only), " L3MissOnly %d", reg.l3_mi= ss_only); =20 - printf("ibs_op_ctl:\t%016llx MaxCnt %9d%s En %d Val %d CntCtl %d=3D%s Cur= Cnt %9d\n", + if (ldlat_cap) { + snprintf(ldlat, sizeof(ldlat), " LdLatThrsh %2d LdLatEn %d", + reg.ldlat_thrsh, reg.ldlat_en); + } + + printf("ibs_op_ctl:\t%016llx MaxCnt %9d%s En %d Val %d CntCtl %d=3D%s Cur= Cnt %9d%s\n", reg.val, ((reg.opmaxcnt_ext << 16) | reg.opmaxcnt) << 4, l3_miss_only, reg.op_en, reg.op_val, reg.cnt_ctl, - reg.cnt_ctl ? "uOps" : "cycles", reg.opcurcnt); + reg.cnt_ctl ? "uOps" : "cycles", reg.opcurcnt, ldlat); } =20 static void pr_ibs_op_data(union ibs_op_data reg) @@ -331,6 +338,9 @@ bool evlist__has_amd_ibs(struct evlist *evlist) if (perf_env__find_pmu_cap(env, "ibs_op", "zen4_ibs_extensions")) zen4_ibs_extensions =3D 1; =20 + if (perf_env__find_pmu_cap(env, "ibs_op", "ldlat")) + ldlat_cap =3D 1; + if (ibs_fetch_type || ibs_op_type) { if (!cpu_family) parse_cpuid(env); --=20 2.43.0