From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752097AbdHFV0M (ORCPT ); Sun, 6 Aug 2017 17:26:12 -0400 Received: from mail.kdab.com ([176.9.126.58]:46178 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751407AbdHFVZN (ORCPT ); Sun, 6 Aug 2017 17:25:13 -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 11/14] perf report: cache srclines for callchain nodes Date: Sun, 6 Aug 2017 23:24:43 +0200 Message-Id: <20170806212446.24925-12-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 On one hand this ensures that the memory is properly freed when the DSO gets freed. On the other hand this significantly speeds up the processing of the callchain nodes when lots of srclines are requested. For one of my data files e.g.: Before: Performance counter stats for 'perf report -s srcline -g srcline --stdio': 52496.495043 task-clock (msec) # 0.999 CPUs utilized 634 context-switches # 0.012 K/sec 2 cpu-migrations # 0.000 K/sec 191,561 page-faults # 0.004 M/sec 165,074,498,235 cycles # 3.144 GHz 334,170,832,408 instructions # 2.02 insn per cycle 90,220,029,745 branches # 1718.591 M/sec 654,525,177 branch-misses # 0.73% of all branches 52.533273822 seconds time elapsedProcessed 236605 events and lost 40 chunks! After: Performance counter stats for 'perf report -s srcline -g srcline --stdio': 22606.323706 task-clock (msec) # 1.000 CPUs utilized 31 context-switches # 0.001 K/sec 0 cpu-migrations # 0.000 K/sec 185,471 page-faults # 0.008 M/sec 71,188,113,681 cycles # 3.149 GHz 133,204,943,083 instructions # 1.87 insn per cycle 34,886,384,979 branches # 1543.214 M/sec 278,214,495 branch-misses # 0.80% of all branches 22.609857253 seconds time elapsed Note that the difference is only this large when `--inline` is not passed. In such situations, we would use the inliner cache and thus do not run this code path that often. I think that this cache should actually be used in other places, too. When looking at the valgrind leak report for perf report, we see tons of srclines being leaked, most notably from calls to hist_entry__get_srcline. The problem is that get_srcline has many different formatting options (show_sym, show_addr, potentially even unwind_inlines when calling __get_srcline directly). As such, the srcline cannot easily be cached for all calls, or we'd have to add caches for all formatting combinations (6 so far). An alternative would be to remove the formatting options and handle that on a different level - i.e. print the sym/addr on demand wherever we actually output something. And the unwind_inlines could be moved into a separate function that does not return the srcline. 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/dso.c | 1 + tools/perf/util/dso.h | 1 + tools/perf/util/machine.c | 17 +++++++++--- tools/perf/util/srcline.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/srcline.h | 7 +++++ 5 files changed, 89 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 72e6e390fd26..8c7f2862cff2 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1235,6 +1235,7 @@ void dso__delete(struct dso *dso) for (i = 0; i < MAP__NR_TYPES; ++i) symbols__delete(&dso->symbols[i]); inlines__tree_delete(&dso->inlined_nodes); + srcline__tree_delete(&dso->srclines); if (dso->short_name_allocated) { zfree((char **)&dso->short_name); diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index 7d1e2b3c1f10..ac3a65a30ff2 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -142,6 +142,7 @@ struct dso { struct rb_root symbols[MAP__NR_TYPES]; struct rb_root symbol_names[MAP__NR_TYPES]; struct rb_root inlined_nodes; + struct rb_root srclines; struct { u64 addr; struct symbol *symbol; diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 479c42450d6a..c5ee6ba2b9ae 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1675,11 +1675,22 @@ struct mem_info *sample__resolve_mem(struct perf_sample *sample, static char *callchain_srcline(struct map *map, struct symbol *sym, u64 ip) { + char *srcline = NULL; + if (!map || callchain_param.key == CCKEY_FUNCTION) - return NULL; + return srcline; + + srcline = srcline__tree_find(&map->dso->srclines, ip); + if (!srcline) { + bool show_sym = false; + bool show_addr = callchain_param.key == CCKEY_ADDRESS; + + srcline = get_srcline(map->dso, map__rip_2objdump(map, ip), + sym, show_sym, show_addr); + srcline__tree_insert(&map->dso->srclines, ip, srcline); + } - return get_srcline(map->dso, map__rip_2objdump(map, ip), - sym, false, callchain_param.key == CCKEY_ADDRESS); + return srcline; } static int add_callchain_ip(struct thread *thread, diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c index 01b4d5ee51fd..0c5ee741c515 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -531,6 +531,72 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym, return __get_srcline(dso, addr, sym, show_sym, show_addr, false); } +struct srcline_node { + u64 addr; + char *srcline; + struct rb_node rb_node; +}; + +void srcline__tree_insert(struct rb_root *tree, u64 addr, char *srcline) +{ + struct rb_node **p = &tree->rb_node; + struct rb_node *parent = NULL; + struct srcline_node *i, *node; + + node = zalloc(sizeof(struct srcline_node)); + if (!node) { + perror("not enough memory for the srcline node"); + return; + } + + node->addr = addr; + node->srcline = srcline; + + while (*p != NULL) { + parent = *p; + i = rb_entry(parent, struct srcline_node, rb_node); + if (addr < i->addr) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + rb_link_node(&node->rb_node, parent, p); + rb_insert_color(&node->rb_node, tree); +} + +char *srcline__tree_find(struct rb_root *tree, u64 addr) +{ + struct rb_node *n = tree->rb_node; + + while (n) { + struct srcline_node *i = rb_entry(n, struct srcline_node, + rb_node); + + if (addr < i->addr) + n = n->rb_left; + else if (addr > i->addr) + n = n->rb_right; + else + return i->srcline; + } + + return NULL; +} + +void srcline__tree_delete(struct rb_root *tree) +{ + struct srcline_node *pos; + struct rb_node *next = rb_first(tree); + + while (next) { + pos = rb_entry(next, struct srcline_node, rb_node); + next = rb_next(&pos->rb_node); + rb_erase(&pos->rb_node, tree); + free_srcline(pos->srcline); + zfree(&pos); + } +} + struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr, struct symbol *sym) { diff --git a/tools/perf/util/srcline.h b/tools/perf/util/srcline.h index 0d2aca92e8c7..187a71082cb8 100644 --- a/tools/perf/util/srcline.h +++ b/tools/perf/util/srcline.h @@ -15,6 +15,13 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym, bool show_sym, bool show_addr, bool unwind_inlines); void free_srcline(char *srcline); +// insert the srcline into the DSO, which will take ownership +void srcline__tree_insert(struct rb_root *tree, u64 addr, char *srcline); +// find previously inserted srcline +char *srcline__tree_find(struct rb_root *tree, u64 addr); +// delete all srclines within the tree +void srcline__tree_delete(struct rb_root *tree); + #define SRCLINE_UNKNOWN ((char *) "??:0") struct inline_list { -- 2.13.3