From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (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 309BA3FADE0; Fri, 24 Jul 2026 09:52:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784886744; cv=none; b=U1HKHalEPDnFz+I3ldrWSLdIQgRDlj3EgAagVA+GzlSlTivGslwssxQKRGWQLyGky5FBEEkO5AfQhxS2CGjouebmMWqnuWSYlmc+Wa6gVwSbVfJvXbdeHvVmzO2IQWrk/inbLr3sGDwNG3yDGkFjCSY7QtoldiHe7vciad97dvQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784886744; c=relaxed/simple; bh=CIDMAFHYlr59s82yhXhANsAdtCPzJ8b3nMa11+26oFo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jReUsbwMcfgUGlQ1PGxHah0L/g5DthD8Qu3nwWXIDLP3wQqsvatqAtwvm0d2Z2NWTc2eubUuyGnqJAsPNsvcU4sEzyBFF9DH16JUlfVwBTObCqSGJz7aus68wjvXFbUAewnF5wArR/2aN3ma3QtoXuiGjW9hx19TM39LqsWqOZg= 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=j5E1fET4; arc=none smtp.client-ip=198.175.65.11 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="j5E1fET4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1784886744; x=1816422744; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CIDMAFHYlr59s82yhXhANsAdtCPzJ8b3nMa11+26oFo=; b=j5E1fET4C/E4mGwrmwEU/5kHYWarDu0tsfDL+9ZedfvyKKPAV6VZ15ck aXZL0fg9x8THxp+Un0HN65Yz5Q4uxY/h0HwmSZa3CkO2XBjMyqvaO/mwd KtNKo0K/nQNV+A1H3xYBw/DwKT6x+RxUs3CCLuGK6KlJZp2JcMMzCWwBl KHgzChQNCkElMTGMyPz6kF7henHX95ah6Ewl/FrZf7li2uQ4MuzPQRj2y bK9jPrbEWwJ5hXvPIgkrUc4xuX2KrbOnG44SH485WonVN0UGFKUmwQH7I wNcW4HRg2ARhoX0ZgjMN2uGWTNFhxALgAUp3kOv3CVxpdkwIcUTrpvTDa A==; X-CSE-ConnectionGUID: BU+PJpNES8C05ezlve+GWQ== X-CSE-MsgGUID: guXU3l0vS9qs8btTT4hUug== X-IronPort-AV: E=McAfee;i="6800,10657,11854"; a="95907617" X-IronPort-AV: E=Sophos;i="6.25,182,1779174000"; d="scan'208";a="95907617" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2026 02:52:23 -0700 X-CSE-ConnectionGUID: 8dXMjCEuQYmJcM02jtVTog== X-CSE-MsgGUID: v+rIlqF7T9ir9Gbif1LmLg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,182,1779174000"; d="scan'208";a="256018475" Received: from linux-pnp-gnr-1.sh.intel.com ([10.239.83.186]) by fmviesa008.fm.intel.com with ESMTP; 24 Jul 2026 02:52:18 -0700 From: Jiebin Sun To: Namhyung Kim , acme@kernel.org, mingo@redhat.com, peterz@infradead.org Cc: adrian.hunter@intel.com, alexander.shishkin@linux.intel.com, irogers@google.com, james.clark@linaro.org, jolsa@kernel.org, mark.rutland@arm.com, dapeng1.mi@linux.intel.com, thomas.falcon@intel.com, tianyou.li@intel.com, wangyang.guo@intel.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Jiebin Sun Subject: [PATCH v4 5/9] perf c2c: add function view stats merge and memory management Date: Fri, 24 Jul 2026 17:58:38 +0800 Message-ID: <20260724095842.995920-6-jiebin.sun@intel.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260724095842.995920-1-jiebin.sun@intel.com> References: <20260717020530.1645123-1-jiebin.sun@intel.com> <20260724095842.995920-1-jiebin.sun@intel.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add the per-entry stats/cstats aggregation helpers, the borrowed-reference teardown for hierarchy children (which frees only the owned resources and never the borrowed thread/ms), and the pruning of cachelines/functions with no contention. These are used by the entry-creation and builder patches that follow and are __maybe_unused until then. Signed-off-by: Jiebin Sun Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Dapeng Mi Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Thomas Falcon Reviewed-by: Tianyou Li Reviewed-by: Wangyang Guo --- tools/perf/ui/browsers/c2c-function.c | 196 ++++++++++++++++++++++++++ 1 file changed, 196 insertions(+) diff --git a/tools/perf/ui/browsers/c2c-function.c b/tools/perf/ui/browsers/c2c-function.c index 21e156bbbef3..1bddc6bdc073 100644 --- a/tools/perf/ui/browsers/c2c-function.c +++ b/tools/perf/ui/browsers/c2c-function.c @@ -671,6 +671,202 @@ c2c_function_hists__reinit(struct c2c_hists *c2c_hists, return function_hpp_list__parse(&c2c_hists->list, output, sort, env); } +static void c2c_stats_merge(struct stats *dest, const struct stats *src) +{ + double delta; + + if (src->n == 0) + return; + + if (dest->n == 0) { + *dest = *src; + return; + } + + delta = src->mean - dest->mean; + dest->M2 += src->M2 + delta * delta * dest->n * src->n / (dest->n + src->n); + dest->mean = (dest->mean * dest->n + src->mean * src->n) / (dest->n + src->n); + dest->n += src->n; + + /* Update min/max */ + if (src->max > dest->max) + dest->max = src->max; + if (src->min < dest->min) + dest->min = src->min; +} + +/* Merge compute_stats during function aggregation. */ +static void __maybe_unused c2c_add_cstats(struct compute_stats *dest, + const struct compute_stats *src) +{ + c2c_stats_merge(&dest->rmt_hitm, &src->rmt_hitm); + c2c_stats_merge(&dest->lcl_hitm, &src->lcl_hitm); + c2c_stats_merge(&dest->rmt_peer, &src->rmt_peer); + c2c_stats_merge(&dest->lcl_peer, &src->lcl_peer); + c2c_stats_merge(&dest->load, &src->load); +} + +static bool __maybe_unused hist_entry__add_c2c_stats(struct hist_entry *he, + const struct c2c_stats *stats) +{ + u64 nr_events = c2c_hitm_count(stats) + stats->rmt_peer + stats->lcl_peer; + u64 weight1 = c2c_hitm_count(stats); + + he->stat.nr_events += nr_events; + he->stat.period += nr_events; + he->stat.weight1 += weight1; + + if (!symbol_conf.cumulate_callchain) + return true; + + if (!he->stat_acc) { + he->stat_acc = calloc(1, sizeof(struct he_stat)); + if (!he->stat_acc) + return false; + } + + he->stat_acc->nr_events += nr_events; + he->stat_acc->period += nr_events; + he->stat_acc->weight1 += weight1; + + return true; +} + +static void c2c_he__free_hierarchy(struct hist_entry *he); + +/* + * Free a function-view histogram entry (hist_entry_ops::free). + */ +static void __maybe_unused c2c_function_he_free(void *ptr) +{ + struct hist_entry *he = ptr; + struct c2c_hist_entry *c2c_he; + + c2c_he = container_of(he, struct c2c_hist_entry, he); + + if (c2c_he->hists) { + perf_hpp__reset_output_field(&c2c_he->hists->list); + hists__delete_all_entries(&c2c_he->hists->hists); + zfree(&c2c_he->hists); + } + + c2c_he__free_hierarchy(he); + + zfree(&c2c_he->nodeset); + zfree(&c2c_he->cpuset); + zfree(&c2c_he->nodestr); + zfree(&c2c_he->node_stats); + + free(c2c_he); +} + +/* + * Free all child entries under @he, recursively (hroot_out sub-tree). + * + * Children are built by c2c_child_entry__alloc(), which BORROWS thread and + * ms (plain copy, no thread__get()/map__get()) and OWNS only mem_info (a + * clone), stat_acc and the c2c-specific fields (hists, cpuset, nodeset, + * nodestr, node_stats). We therefore must NOT call hist_entry__delete() + * here: it would thread__zput()/map_symbol__exit() the borrowed refs and + * underflow their refcounts. Free exactly the owned resources instead. + */ +/* + * Free one child entry @child_he and everything below it. Frees exactly the + * resources c2c_child_entry__alloc() owns (mem_info clone, stat_acc, hists and + * the c2c-specific arrays); the borrowed thread/ms are left untouched. + */ +static void c2c_child_he__free(struct hist_entry *child_he) +{ + struct c2c_hist_entry *child_c2c = container_of(child_he, struct c2c_hist_entry, he); + + if (child_he->stat_acc) + zfree(&child_he->stat_acc); + + if (child_he->mem_info) + mem_info__put(child_he->mem_info); + + if (child_c2c->hists) { + perf_hpp__reset_output_field(&child_c2c->hists->list); + hists__delete_all_entries(&child_c2c->hists->hists); + zfree(&child_c2c->hists); + } + + zfree(&child_c2c->cpuset); + zfree(&child_c2c->nodeset); + zfree(&child_c2c->nodestr); + zfree(&child_c2c->node_stats); + + c2c_he__free_hierarchy(child_he); + + free(child_c2c); +} + +static void c2c_he__free_hierarchy(struct hist_entry *he) +{ + struct rb_node *nd; + struct hist_entry *child_he; + + /* + * Leaf entries alias hroot_out with sorted_chain (callchains) in a + * union, so they have no child hierarchy to free here. + */ + if (he->leaf) + return; + + if (RB_EMPTY_ROOT(&he->hroot_out.rb_root)) + return; + + nd = rb_first_cached(&he->hroot_out); + while (nd) { + struct rb_node *next = rb_next(nd); + + child_he = rb_entry(nd, struct hist_entry, rb_node); + rb_erase_cached(&child_he->rb_node, &he->hroot_out); + c2c_child_he__free(child_he); + + nd = next; + } + + /* All children erased; clear the tree (and its cached leftmost). */ + he->hroot_out = RB_ROOT_CACHED; +} + +/* + * Drop level-2 writing functions that carry no stores (child_stores == 0) or + * no cacheline children. Writers are only added when they store into a shared + * line, so this is mainly a safety net. Returns the number of surviving + * writers. + */ +static int __maybe_unused c2c_he__prune_empty_writers(struct hist_entry *l1_he) +{ + struct rb_node *nd; + int surviving = 0; + + if (!l1_he->has_children) + return 0; + + nd = rb_first_cached(&l1_he->hroot_out); + while (nd) { + struct rb_node *next = rb_next(nd); + struct hist_entry *l2_he = rb_entry(nd, struct hist_entry, rb_node); + + if (l2_he->has_children && hist_entry__child_stores(l2_he) > 0) + surviving++; + else { + rb_erase_cached(&l2_he->rb_node, &l1_he->hroot_out); + c2c_child_he__free(l2_he); + } + nd = next; + } + + if (!surviving) { + l1_he->hroot_out = RB_ROOT_CACHED; + l1_he->has_children = false; + l1_he->unfolded = false; + } + return surviving; +} + int perf_c2c__browse_function_view(struct hists *hists __maybe_unused) { ui__warning("C2C function view is not implemented yet.\n"); -- 2.52.0