From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751989AbdHFVZO (ORCPT ); Sun, 6 Aug 2017 17:25:14 -0400 Received: from mail.kdab.com ([176.9.126.58]:46156 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751677AbdHFVZL (ORCPT ); Sun, 6 Aug 2017 17:25:11 -0400 From: Milian Wolff To: acme@kernel.org, Jin Yao , Linux-kernel@vger.kernel.org, Namhyung Kim Cc: linux-perf-users@vger.kernel.org, Milian Wolff , Arnaldo Carvalho de Melo , David Ahern , Peter Zijlstra Subject: [PATCH v2 10/14] perf report: cache failed lookups of inlined frames Date: Sun, 6 Aug 2017 23:24:42 +0200 Message-Id: <20170806212446.24925-11-milian.wolff@kdab.com> In-Reply-To: <20170806212446.24925-1-milian.wolff@kdab.com> References: <20170806212446.24925-1-milian.wolff@kdab.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When no inlined frames could be found for a given address, we did not store this information anywhere. That means we potentially do the costly inliner lookup repeatedly for cases where we know it can never succeed. This patch makes dso__parse_addr_inlines always return a valid inline_node. It will be empty when no inliners are found. This enables us to cache the empty list in the DSO, thereby improving the performance when many addresses fail to find the inliners. For my trivial example, the performance impact is already quite significant: Before: ~~~~~ Performance counter stats for 'perf report --stdio --inline -g srcline -s srcline' (5 runs): 594.804032 task-clock (msec) # 0.998 CPUs utilized ( +- 0.07% ) 53 context-switches # 0.089 K/sec ( +- 4.09% ) 0 cpu-migrations # 0.000 K/sec ( +-100.00% ) 5,687 page-faults # 0.010 M/sec ( +- 0.02% ) 2,300,918,213 cycles # 3.868 GHz ( +- 0.09% ) 4,395,839,080 instructions # 1.91 insn per cycle ( +- 0.00% ) 939,177,205 branches # 1578.969 M/sec ( +- 0.00% ) 11,824,633 branch-misses # 1.26% of all branches ( +- 0.10% ) 0.596246531 seconds time elapsed ( +- 0.07% ) ~~~~~ After: ~~~~~ Performance counter stats for 'perf report --stdio --inline -g srcline -s srcline' (5 runs): 113.111405 task-clock (msec) # 0.990 CPUs utilized ( +- 0.89% ) 29 context-switches # 0.255 K/sec ( +- 54.25% ) 0 cpu-migrations # 0.000 K/sec 5,380 page-faults # 0.048 M/sec ( +- 0.01% ) 432,378,779 cycles # 3.823 GHz ( +- 0.75% ) 670,057,633 instructions # 1.55 insn per cycle ( +- 0.01% ) 141,001,247 branches # 1246.570 M/sec ( +- 0.01% ) 2,346,845 branch-misses # 1.66% of all branches ( +- 0.19% ) 0.114222393 seconds time elapsed ( +- 1.19% ) ~~~~~ Cc: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Yao Jin Signed-off-by: Milian Wolff --- tools/perf/util/machine.c | 15 +++++++-------- tools/perf/util/srcline.c | 18 ++---------------- 2 files changed, 9 insertions(+), 24 deletions(-) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index a7f8499c8756..479c42450d6a 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -2062,9 +2062,10 @@ static int append_inlines(struct callchain_cursor *cursor, struct inline_node *inline_node; struct inline_list *ilist; u64 addr; + int ret = 1; if (!symbol_conf.inline_name || !map || !sym) - return 1; + return ret; addr = map__rip_2objdump(map, ip); @@ -2072,22 +2073,20 @@ static int append_inlines(struct callchain_cursor *cursor, if (!inline_node) { inline_node = dso__parse_addr_inlines(map->dso, addr, sym); if (!inline_node) - return 1; - + return ret; inlines__tree_insert(&map->dso->inlined_nodes, inline_node); } list_for_each_entry(ilist, &inline_node->val, list) { - int ret = callchain_cursor_append(cursor, ip, map, - ilist->symbol, false, - NULL, 0, 0, 0, - ilist->srcline); + ret = callchain_cursor_append(cursor, ip, map, + ilist->symbol, false, + NULL, 0, 0, 0, ilist->srcline); if (ret != 0) return ret; } - return 0; + return ret; } static int unwind_entry(struct unwind_entry *entry, void *arg) diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c index a1fdf035d1dd..01b4d5ee51fd 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -343,17 +343,8 @@ static struct inline_node *addr2inlines(const char *dso_name, u64 addr, INIT_LIST_HEAD(&node->val); node->addr = addr; - if (!addr2line(dso_name, addr, NULL, NULL, dso, TRUE, node, sym)) - goto out_free_inline_node; - - if (list_empty(&node->val)) - goto out_free_inline_node; - - return node; - -out_free_inline_node: - inline_node__delete(node); - return NULL; + addr2line(dso_name, addr, NULL, NULL, dso, TRUE, node, sym); + return node; } #else /* HAVE_LIBBFD_SUPPORT */ @@ -469,11 +460,6 @@ static struct inline_node *addr2inlines(const char *dso_name, u64 addr, out: pclose(fp); - if (list_empty(&node->val)) { - inline_node__delete(node); - return NULL; - } - return node; } -- 2.13.3