From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 59ADD519DE7; Wed, 23 Sep 2026 15:57:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790179038; cv=none; b=CuJC6Q97bO30Jyzuus3Q/72kZWqugiF/aOqNpAwZN00wQ6tQRBkkTrjSQEx5qxrJg+YLfkUG/OAUQgo1y9gbGXA/YlBAQdzvlE145/eHgAkwu7GGQxYhrW/ZJ/WC9cMbrk2M63G/ns8gWxdcfPMhm3wSrlGYYdcQ9esawUFeH2A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790179038; c=relaxed/simple; bh=w8TbIiOpQ7bE19y47kGM0xVJA3lsoPU/laYEfHXkYCw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qp9sZ8E4OqWWnqZreXdBQxlSVzZ8NI5iL1ISiZ2OcNtsnJ5xIcoykfjVoLNhgNdr/kSTO4B+goutYuxabLs3Ydk9JIx32dt+1slw+OQJHz5As3r93MqeGvuPVUyUxAnLALefPVZqgnmi//9/kW14azWSY7nTlB+Jz1gpA/rZs5g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=mQyQmZxi; arc=none smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="mQyQmZxi" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1790179034; x=1821715034; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=w8TbIiOpQ7bE19y47kGM0xVJA3lsoPU/laYEfHXkYCw=; b=mQyQmZxiUxr/uSLEUpEYSaoYZcdvtTc7Va4h6AFpCeWXxrFj/LWpS9Ig Ybe/NS35hfDPsFwRePMXWNDWd7Cusywsh0ex3ZQL/VpVKeKwiWQzzRfzS n/EcYEltP1+wIcDKnYGxW7cmDA7iXrS7oIxMGD7aWquMoWMpN63C8r3EK R/rZ/AYwqq00vbkw0gkmbF5IxPKaB9KcDWpreqKsg75F3oMd7SSRLvLgL a8UWoSuISy5QGLiNqgnZ+tkQF+2WvIWnjlHf2JtmOgUfSs2pRNqIck14o VGLcWB6qP9Vo/WHuLWOojP/xcwVwNu+mKYlraRk75vKyMXG89iENZttuS g==; X-CSE-ConnectionGUID: 032twSy+Q+Cwj0Yi1e3UzQ== X-CSE-MsgGUID: sDOqhqbbSaSvs6YgBFdtog== X-IronPort-AV: E=McAfee;i="6800,10657,11914"; a="78445954" X-IronPort-AV: E=Sophos;i="6.27,118,1787036400"; d="scan'208";a="78445954" Received: from fmviesa013.fm.intel.com ([10.60.135.153]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Sep 2026 08:57:13 -0700 X-CSE-ConnectionGUID: O5ZFs3UvR5KsiuLK0tu5Gg== X-CSE-MsgGUID: 5epTutgBQS++SDUak7zeAg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,118,1787036400"; d="scan'208";a="4935333" Received: from rosenzwe-mobl1.amr.corp.intel.com (HELO tfalcon-desk.attlocal.net) ([10.124.221.119]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Sep 2026 08:57:12 -0700 From: Thomas Falcon To: Dapeng Mi Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark Subject: [PATCH v11 4/6] perf tools: Show memory region in perf-c2c subcommand Date: Wed, 23 Sep 2026 10:57:01 -0500 Message-ID: <20260923155703.34814-5-thomas.falcon@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260923155703.34814-1-thomas.falcon@intel.com> References: <20260923155703.34814-1-thomas.falcon@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Dapeng Mi Add memory region field to the cacheline list view to help users identify the memory region to which the cacheline belongs. The memory region field was included with the introduction of support for the Off-module Response facility (OMR) [1] in Intel's Diamond Rapids and Nova Lake architectures. An example of the new perf c2c output including the memory region field is shown below: # Index Address Region Node PA cnt Hitm Total LclHitm RmtHitm records Loads # ..... .................. ...... .... ...... ....... ....... ....... ....... ....... ....... # 0 0xffffffff84eb0040 N/A 0 1205 23.25% 544 544 0 1677 1677 1 0xffffffff84f03a80 N/A 0 1 18.12% 424 424 0 585 585 [...] 19 0xffffffff845bc840 Mem-0 0 13 0.30% 7 7 0 31 31 20 0xff3bbba284520a00 N/A 0 10 0.26% 6 6 0 11 11 21 0xff3bbbe0bc833500 N/A 0 24 0.26% 6 6 0 30 30 [1]: https://lore.kernel.org/all/20260114011750.350569-1-dapeng1.mi@linux.intel.com/ Assisted-by: Sashiko:gemini-3.1-pro-preview Assisted-by: GitHub-Copilot:claude-opus-4-8 Reviewed-by: Ian Rogers Reviewed-by: Namhyung Kim Signed-off-by: Dapeng Mi Co-developed-by: Thomas Falcon Signed-off-by: Thomas Falcon --- v11: perf-c2c: revert to only recording a real memory region for a cacheline v10: only update mem_region for real cache/memory regions so N/A samples don't overwrite a valid region; add #include for asprintf (Sashiko) v9: Update perf-c2c to include cache region reporting (Dapeng Mi) v8: Update developer tags and commit message with real example output (Dapeng Mi) v7: fix output_str allocation error handling which introduced a memory leak (Sashiko) v6: rebased onto 7.3-rc1 v5: make the cacheline header span and ui_quirks() width fixup depend on memory-region availability (Namhyung Kim) v4: correctly handle output_str memory allocation failure v3: make memory region reporting conditional on feature bit --- tools/perf/builtin-c2c.c | 114 +++++++++++++++++++++++++++++++++++---- tools/perf/util/c2c.h | 1 + 2 files changed, 104 insertions(+), 11 deletions(-) diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c index 6b64c0d6b24f..a42423ca990d 100644 --- a/tools/perf/builtin-c2c.c +++ b/tools/perf/builtin-c2c.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -72,6 +73,7 @@ struct perf_c2c { bool show_src; bool show_all; + bool show_mem_region; bool use_stdio; bool stats_only; bool symbol_full; @@ -248,6 +250,18 @@ static void c2c_he__set_node(struct c2c_hist_entry *c2c_he, } } +static void c2c_he__set_mem_region(struct c2c_hist_entry *c2c_he, + unsigned int mem_region) +{ + if (WARN_ONCE(mem_region > PERF_MEM_REGION_MEM7, + "WARNING: invalid memory region ID\n")) + return; + + /* Update mem_region only if it really accesses memory */ + if (mem_region >= PERF_MEM_REGION_MMIO) + c2c_he->mem_region = mem_region; +} + static void compute_stats(struct c2c_hist_entry *c2c_he, struct c2c_stats *stats, u64 weight) @@ -306,6 +320,7 @@ static int process_sample_event(const struct perf_tool *tool __maybe_unused, struct addr_location al; struct mem_info *mi = NULL; struct callchain_cursor *cursor; + unsigned int mem_region; int ret; addr_location__init(&al); @@ -333,6 +348,7 @@ static int process_sample_event(const struct perf_tool *tool __maybe_unused, } c2c_decode_stats(&stats, mi); + mem_region = mem_info__data_src(mi)->mem_region; he = hists__add_entry_ops(&c2c_hists->hists, &c2c_entry_ops, &al, NULL, NULL, mi, NULL, @@ -349,6 +365,7 @@ static int process_sample_event(const struct perf_tool *tool __maybe_unused, c2c_he__set_cpu(c2c_he, sample); c2c_he__set_node(c2c_he, sample); c2c_he__set_evsel(c2c_he, evsel); + c2c_he__set_mem_region(c2c_he, mem_region); hists__inc_nr_samples(&c2c_hists->hists, he->filtered); @@ -402,6 +419,7 @@ static int process_sample_event(const struct perf_tool *tool __maybe_unused, c2c_he__set_cpu(c2c_he, sample); c2c_he__set_node(c2c_he, sample); c2c_he__set_evsel(c2c_he, evsel); + c2c_he__set_mem_region(c2c_he, mem_region); hists__inc_nr_samples(&c2c_hists->hists, he->filtered); ret = hist_entry__append_callchain(he, sample); @@ -540,6 +558,45 @@ dcacheline_node_count(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp, return scnprintf(hpp->buf, hpp->size, "%*lu", width, c2c_he->paddr_cnt); } +static int +dcacheline_node_mem_region(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp, + struct hist_entry *he) +{ + int width = c2c_width(fmt, hpp, he->hists); + struct c2c_hist_entry *c2c_he; + unsigned int mem_region; + char buf[20]; + + c2c_he = container_of(he, struct c2c_hist_entry, he); + mem_region = c2c_he->mem_region; + + switch (mem_region) { + case PERF_MEM_REGION_NA: + case PERF_MEM_REGION_RSVD: + scnprintf(buf, sizeof(buf), "N/A"); + break; + case PERF_MEM_REGION_MMIO: + scnprintf(buf, sizeof(buf), "MMIO"); + break; + case PERF_MEM_REGION_MEM0: + case PERF_MEM_REGION_MEM1: + case PERF_MEM_REGION_MEM2: + case PERF_MEM_REGION_MEM3: + case PERF_MEM_REGION_MEM4: + case PERF_MEM_REGION_MEM5: + case PERF_MEM_REGION_MEM6: + case PERF_MEM_REGION_MEM7: + scnprintf(buf, sizeof(buf), "Mem-%d", + mem_region - PERF_MEM_REGION_MEM0); + break; + default: + scnprintf(buf, sizeof(buf), "N/A"); + break; + } + + return scnprintf(hpp->buf, hpp->size, "%*s", width, buf); +} + static int offset_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp, struct hist_entry *he) { @@ -1360,6 +1417,14 @@ static struct c2c_dimension dim_dcacheline_node = { .width = 4, }; +static struct c2c_dimension dim_dcacheline_mem_region = { + .header = HEADER_LOW("Region"), + .name = "dcacheline_mem_region", + .cmp = empty_cmp, + .entry = dcacheline_node_mem_region, + .width = 6, +}; + static struct c2c_dimension dim_dcacheline_count = { .header = HEADER_LOW("PA cnt"), .name = "dcacheline_count", @@ -1791,6 +1856,7 @@ static struct c2c_dimension dim_dcacheline_num_empty = { static struct c2c_dimension *dimensions[] = { &dim_dcacheline, + &dim_dcacheline_mem_region, &dim_dcacheline_node, &dim_dcacheline_count, &dim_offset, @@ -2854,8 +2920,11 @@ static int ui_quirks(void) /* Fix the zero line for dcacheline column. */ buf = fill_line(chk_double_cl ? "Double-Cacheline" : "Cacheline", dim_dcacheline.width + + (c2c.show_mem_region ? + dim_dcacheline_mem_region.width : 0) + dim_dcacheline_node.width + - dim_dcacheline_count.width + 4); + dim_dcacheline_count.width + + (c2c.show_mem_region ? 6 : 4)); if (!buf) return -ENOMEM; @@ -3107,7 +3176,8 @@ static int perf_c2c__report(int argc, const char **argv) OPT_END() }; int err = 0; - const char *output_str, *sort_str = NULL; + const char *sort_str = NULL; + char *output_str = NULL; struct perf_env *env; annotation_options__init(); @@ -3272,9 +3342,16 @@ static int perf_c2c__report(int argc, const char **argv) goto out_mem2node; } - if (c2c.display != DISPLAY_SNP_PEER) - output_str = "cl_idx," + c2c.show_mem_region = perf_header__has_feat(&session->header, + HEADER_MEMORY_RANGES); + if (c2c.show_mem_region) + dim_dcacheline.header.line[0].span = 3; + + if (c2c.display != DISPLAY_SNP_PEER) { + if (asprintf(&output_str, + "cl_idx," "dcacheline," + "%s" "dcacheline_node," "dcacheline_count," "percent_costly_snoop," @@ -3286,10 +3363,17 @@ static int perf_c2c__report(int argc, const char **argv) "ld_fbhit,ld_l1hit,ld_l2hit," "ld_lclhit,lcl_hitm," "ld_rmthit,rmt_hitm," - "dram_lcl,dram_rmt"; - else - output_str = "cl_idx," + "dram_lcl,dram_rmt", + c2c.show_mem_region ? + "dcacheline_mem_region," : "") < 0) { + err = -ENOMEM; + goto out_mem2node; + } + } else { + if (asprintf(&output_str, + "cl_idx," "dcacheline," + "%s" "dcacheline_node," "dcacheline_count," "percent_costly_snoop," @@ -3301,7 +3385,13 @@ static int perf_c2c__report(int argc, const char **argv) "ld_fbhit,ld_l1hit,ld_l2hit," "ld_lclhit,lcl_hitm," "ld_rmthit,rmt_hitm," - "dram_lcl,dram_rmt"; + "dram_lcl,dram_rmt", + c2c.show_mem_region ? + "dcacheline_mem_region," : "") < 0) { + err = -ENOMEM; + goto out_mem2node; + } + } if (c2c.display == DISPLAY_TOT_HITM) sort_str = "tot_hitm"; @@ -3315,7 +3405,7 @@ static int perf_c2c__report(int argc, const char **argv) err = c2c_hists__reinit(&c2c.hists, output_str, sort_str, perf_session__env(session)); if (err) { pr_err("Failed to reinitialize hists\n"); - goto out_mem2node; + goto out_str; } ui_progress__init(&prog, c2c.hists.hists.nr_entries, "Sorting..."); @@ -3324,17 +3414,19 @@ static int perf_c2c__report(int argc, const char **argv) hists__output_resort_cb(&c2c.hists.hists, &prog, resort_shared_cl_cb); err = hists__iterate_cb(&c2c.hists.hists, resort_cl_cb, perf_session__env(session)); if (err) - goto out_mem2node; + goto out_str; ui_progress__finish(); if (ui_quirks()) { pr_err("failed to setup UI\n"); - goto out_mem2node; + goto out_str; } perf_c2c_display(session); +out_str: + free(output_str); out_mem2node: mem2node__exit(&c2c.mem2node); out_session: diff --git a/tools/perf/util/c2c.h b/tools/perf/util/c2c.h index 53f024e25d99..f04e78e1a2e3 100644 --- a/tools/perf/util/c2c.h +++ b/tools/perf/util/c2c.h @@ -33,6 +33,7 @@ struct c2c_hist_entry { unsigned long *nodeset; struct c2c_stats *node_stats; unsigned int cacheline_idx; + unsigned int mem_region; struct compute_stats cstats; -- 2.43.0