Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752420AbaFMGZ3 (ORCPT ); Fri, 13 Jun 2014 02:25:29 -0400 Received: from terminus.zytor.com ([198.137.202.10]:44093 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752308AbaFMGZY (ORCPT ); Fri, 13 Jun 2014 02:25:24 -0400 Date: Thu, 12 Jun 2014 23:24:50 -0700 From: tip-bot for Jiri Olsa Message-ID: Cc: linux-kernel@vger.kernel.org, paulus@samba.org, hpa@zytor.com, mingo@kernel.org, jolsa@kernel.org, a.p.zijlstra@chello.nl, jean.pihet@linaro.org, acme@kernel.org, namhyung@kernel.org, fweisbec@gmail.com, dsahern@gmail.com, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com Reply-To: mingo@kernel.org, hpa@zytor.com, paulus@samba.org, linux-kernel@vger.kernel.org, jolsa@kernel.org, a.p.zijlstra@chello.nl, jean.pihet@linaro.org, acme@kernel.org, namhyung@kernel.org, fweisbec@gmail.com, dsahern@gmail.com, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com In-Reply-To: <1401892622-30848-2-git-send-email-jolsa@kernel.org> References: <1401892622-30848-2-git-send-email-jolsa@kernel.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf tools: Cache register accesses for unwind processing Git-Commit-ID: 0c4e774fad0202b91dea8d99c04e9bdf2c2c6647 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 0c4e774fad0202b91dea8d99c04e9bdf2c2c6647 Gitweb: http://git.kernel.org/tip/0c4e774fad0202b91dea8d99c04e9bdf2c2c6647 Author: Jiri Olsa AuthorDate: Thu, 17 Apr 2014 19:39:10 +0200 Committer: Jiri Olsa CommitDate: Thu, 12 Jun 2014 16:53:19 +0200 perf tools: Cache register accesses for unwind processing Caching registers value into an array. Got about 4% speed up of perf_reg_value function for report command processing dwarf unwind stacks. Output from report over 1.5 GB data with DWARF unwind stacks: (TODO fix perf diff) current code: 5.84% perf perf [.] perf_reg_value change: 1.94% perf perf [.] perf_reg_value And little bit of overall speed up: (perf stat -r 5 -e '{cycles,instructions}:u' ...) current code: 310,298,611,754 cycles ( +- 0.33% ) 439,669,689,341 instructions ( +- 0.03% ) 188.656753166 seconds time elapsed ( +- 0.82% ) change: 291,315,329,878 cycles ( +- 0.22% ) 391,763,485,304 instructions ( +- 0.03% ) 180.742249687 seconds time elapsed ( +- 0.64% ) Acked-by: Namhyung Kim Cc: Arnaldo Carvalho de Melo Cc: Corey Ashford Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jean Pihet Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1401892622-30848-2-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa --- tools/perf/util/event.h | 5 +++++ tools/perf/util/perf_regs.c | 10 +++++++++- tools/perf/util/perf_regs.h | 4 +++- 3 files changed, 17 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h index 9ba2eb3..e5dd40a 100644 --- a/tools/perf/util/event.h +++ b/tools/perf/util/event.h @@ -7,6 +7,7 @@ #include "../perf.h" #include "map.h" #include "build-id.h" +#include "perf_regs.h" struct mmap_event { struct perf_event_header header; @@ -89,6 +90,10 @@ struct regs_dump { u64 abi; u64 mask; u64 *regs; + + /* Cached values/mask filled by first register access. */ + u64 cache_regs[PERF_REGS_MAX]; + u64 cache_mask; }; struct stack_dump { diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c index a3539ef..43168fb 100644 --- a/tools/perf/util/perf_regs.c +++ b/tools/perf/util/perf_regs.c @@ -1,11 +1,15 @@ #include #include "perf_regs.h" +#include "event.h" int perf_reg_value(u64 *valp, struct regs_dump *regs, int id) { int i, idx = 0; u64 mask = regs->mask; + if (regs->cache_mask & (1 << id)) + goto out; + if (!(mask & (1 << id))) return -EINVAL; @@ -14,6 +18,10 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id) idx++; } - *valp = regs->regs[idx]; + regs->cache_mask |= (1 << id); + regs->cache_regs[id] = regs->regs[idx]; + +out: + *valp = regs->cache_regs[id]; return 0; } diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h index 79c78f7..980dbf7 100644 --- a/tools/perf/util/perf_regs.h +++ b/tools/perf/util/perf_regs.h @@ -2,7 +2,8 @@ #define __PERF_REGS_H #include -#include "event.h" + +struct regs_dump; #ifdef HAVE_PERF_REGS_SUPPORT #include @@ -11,6 +12,7 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id); #else #define PERF_REGS_MASK 0 +#define PERF_REGS_MAX 0 static inline const char *perf_reg_name(int id __maybe_unused) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/