From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDFBFCA9EA0 for ; Fri, 25 Oct 2019 18:14:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AFAC02070B for ; Fri, 25 Oct 2019 18:14:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388204AbfJYSO0 (ORCPT ); Fri, 25 Oct 2019 14:14:26 -0400 Received: from mga04.intel.com ([192.55.52.120]:21876 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732284AbfJYSOZ (ORCPT ); Fri, 25 Oct 2019 14:14:25 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Oct 2019 11:14:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,229,1569308400"; d="scan'208";a="224001625" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.137]) by fmsmga004.fm.intel.com with ESMTP; 25 Oct 2019 11:14:24 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id CB2443000FA; Fri, 25 Oct 2019 11:14:24 -0700 (PDT) From: Andi Kleen To: acme@kernel.org Cc: jolsa@kernel.org, eranian@google.com, linux-kernel@vger.kernel.org, Andi Kleen Subject: [PATCH v3 1/7] perf pmu: Use file system cache to optimize sysfs access Date: Fri, 25 Oct 2019 11:14:11 -0700 Message-Id: <20191025181417.10670-2-andi@firstfloor.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191025181417.10670-1-andi@firstfloor.org> References: <20191025181417.10670-1-andi@firstfloor.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andi Kleen pmu.c does a lot of redundant /sys accesses while parsing aliases and probing for PMUs. On large systems with a lot of PMUs this can get expensive (>2s): % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 27.25 1.227847 8 160888 16976 openat 26.42 1.190481 7 164224 164077 stat Add a cache to remember if specific file names exist or don't exist, which eliminates most of this overhead. Also optimize some stat() calls to be slightly cheaper access() Resulting in: 0.18 0.004166 2 1851 305 open 0.08 0.001970 2 829 622 access Signed-off-by: Andi Kleen --- v2: Use single lookup function as API (Jiri) --- tools/perf/util/Build | 1 + tools/perf/util/fncache.c | 63 +++++++++++++++++++++++++++++++++++++++ tools/perf/util/fncache.h | 7 +++++ tools/perf/util/pmu.c | 34 +++++++-------------- tools/perf/util/srccode.c | 9 +----- 5 files changed, 83 insertions(+), 31 deletions(-) create mode 100644 tools/perf/util/fncache.c create mode 100644 tools/perf/util/fncache.h diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 39814b1806a6..2c1504fe924c 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -48,6 +48,7 @@ perf-y += header.o perf-y += callchain.o perf-y += values.o perf-y += debug.o +perf-y += fncache.o perf-y += machine.o perf-y += map.o perf-y += pstack.o diff --git a/tools/perf/util/fncache.c b/tools/perf/util/fncache.c new file mode 100644 index 000000000000..5afcd7edbe7a --- /dev/null +++ b/tools/perf/util/fncache.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Manage a cache of file names' existence */ +#include +#include +#include +#include +#include "fncache.h" + +struct fncache { + struct hlist_node nd; + bool res; + char name[]; +}; + +#define FNHSIZE 61 + +static struct hlist_head fncache_hash[FNHSIZE]; + +unsigned shash(const unsigned char *s) +{ + unsigned h = 0; + while (*s) + h = 65599 * h + *s++; + return h ^ (h >> 16); +} + +static bool lookup_fncache(const char *name, bool *res) +{ + int h = shash((const unsigned char *)name) % FNHSIZE; + struct fncache *n; + + hlist_for_each_entry (n, &fncache_hash[h], nd) { + if (!strcmp(n->name, name)) { + *res = n->res; + return true; + } + } + return false; +} + +static void update_fncache(const char *name, bool res) +{ + struct fncache *n = malloc(sizeof(struct fncache) + strlen(name) + 1); + int h = shash((const unsigned char *)name) % FNHSIZE; + + if (!n) + return; + strcpy(n->name, name); + n->res = res; + hlist_add_head(&n->nd, &fncache_hash[h]); +} + +/* No LRU, only use when bounded in some other way. */ +bool file_available(const char *name) +{ + bool res; + + if (lookup_fncache(name, &res)) + return res; + res = access(name, R_OK) == 0; + update_fncache(name, res); + return res; +} diff --git a/tools/perf/util/fncache.h b/tools/perf/util/fncache.h new file mode 100644 index 000000000000..fe020beaefb1 --- /dev/null +++ b/tools/perf/util/fncache.h @@ -0,0 +1,7 @@ +#ifndef _FCACHE_H +#define _FCACHE_H 1 + +unsigned shash(const unsigned char *s); +bool file_available(const char *name); + +#endif diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index adbe97e941dd..81357cc3d59a 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -24,6 +24,7 @@ #include "pmu-events/pmu-events.h" #include "string2.h" #include "strbuf.h" +#include "fncache.h" struct perf_pmu_format { char *name; @@ -82,7 +83,6 @@ int perf_pmu__format_parse(char *dir, struct list_head *head) */ static int pmu_format(const char *name, struct list_head *format) { - struct stat st; char path[PATH_MAX]; const char *sysfs = sysfs__mountpoint(); @@ -92,8 +92,8 @@ static int pmu_format(const char *name, struct list_head *format) snprintf(path, PATH_MAX, "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name); - if (stat(path, &st) < 0) - return 0; /* no error if format does not exist */ + if (!file_available(path)) + return 0; if (perf_pmu__format_parse(path, format)) return -1; @@ -475,7 +475,6 @@ static int pmu_aliases_parse(char *dir, struct list_head *head) */ static int pmu_aliases(const char *name, struct list_head *head) { - struct stat st; char path[PATH_MAX]; const char *sysfs = sysfs__mountpoint(); @@ -485,8 +484,8 @@ static int pmu_aliases(const char *name, struct list_head *head) snprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/events", sysfs, name); - if (stat(path, &st) < 0) - return 0; /* no error if 'events' does not exist */ + if (!file_available(path)) + return 0; if (pmu_aliases_parse(path, head)) return -1; @@ -525,7 +524,6 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias, */ static int pmu_type(const char *name, __u32 *type) { - struct stat st; char path[PATH_MAX]; FILE *file; int ret = 0; @@ -537,7 +535,7 @@ static int pmu_type(const char *name, __u32 *type) snprintf(path, PATH_MAX, "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name); - if (stat(path, &st) < 0) + if (access(path, R_OK) < 0) return -1; file = fopen(path, "r"); @@ -628,14 +626,11 @@ static struct perf_cpu_map *pmu_cpumask(const char *name) static bool pmu_is_uncore(const char *name) { char path[PATH_MAX]; - struct perf_cpu_map *cpus; - const char *sysfs = sysfs__mountpoint(); + const char *sysfs; + sysfs = sysfs__mountpoint(); snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name); - cpus = __pmu_cpumask(path); - perf_cpu_map__put(cpus); - - return !!cpus; + return file_available(path); } /* @@ -645,7 +640,6 @@ static bool pmu_is_uncore(const char *name) */ static int is_arm_pmu_core(const char *name) { - struct stat st; char path[PATH_MAX]; const char *sysfs = sysfs__mountpoint(); @@ -655,10 +649,7 @@ static int is_arm_pmu_core(const char *name) /* Look for cpu sysfs (specific to arm) */ scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus", sysfs, name); - if (stat(path, &st) == 0) - return 1; - - return 0; + return file_available(path); } static char *perf_pmu__getcpuid(struct perf_pmu *pmu) @@ -1528,7 +1519,6 @@ bool pmu_have_event(const char *pname, const char *name) static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name) { - struct stat st; char path[PATH_MAX]; const char *sysfs; @@ -1538,10 +1528,8 @@ static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name) snprintf(path, PATH_MAX, "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name); - - if (stat(path, &st) < 0) + if (!file_available(path)) return NULL; - return fopen(path, "r"); } diff --git a/tools/perf/util/srccode.c b/tools/perf/util/srccode.c index d84ed8b6caaa..c29edaaca863 100644 --- a/tools/perf/util/srccode.c +++ b/tools/perf/util/srccode.c @@ -16,6 +16,7 @@ #include "srccode.h" #include "debug.h" #include // page_size +#include "fncache.h" #define MAXSRCCACHE (32*1024*1024) #define MAXSRCFILES 64 @@ -36,14 +37,6 @@ static LIST_HEAD(srcfile_list); static long map_total_sz; static int num_srcfiles; -static unsigned shash(unsigned char *s) -{ - unsigned h = 0; - while (*s) - h = 65599 * h + *s++; - return h ^ (h >> 16); -} - static int countlines(char *map, int maplen) { int numl; -- 2.21.0