From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1033028AbbKEO7t (ORCPT ); Thu, 5 Nov 2015 09:59:49 -0500 Received: from mail9.hitachi.co.jp ([133.145.228.44]:41607 "EHLO mail9.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1032776AbbKEO7r (ORCPT ); Thu, 5 Nov 2015 09:59:47 -0500 From: =?utf-8?B?5bmz5p2+6ZuF5bezIC8gSElSQU1BVFXvvIxNQVNBTUk=?= To: "'Namhyung Kim'" , Tom Zanussi CC: "rostedt@goodmis.org" , "daniel.wagner@bmw-carit.de" , "josh@joshtriplett.org" , "andi@firstfloor.org" , "mathieu.desnoyers@efficios.com" , "peterz@infradead.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH 00/28] tracing: 'hist' triggers Thread-Topic: [PATCH 00/28] tracing: 'hist' triggers Thread-Index: AQHRF9hiBray7IHxwUqsBu73iroOup6NgqfA Date: Thu, 5 Nov 2015 14:59:42 +0000 Message-ID: <50399556C9727B4D88A595C8584AAB3752604CE8@GSjpTKYDCembx32.service.hitachi.net> References: <20151105144334.GA28273@danjae.kornet> In-Reply-To: <20151105144334.GA28273@danjae.kornet> Accept-Language: ja-JP, en-US Content-Language: ja-JP X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.198.219.51] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id tA5ExsBx021397 From: Namhyung Kim [mailto:namhyung@gmail.com] On Behalf Of Namhyung Kim > >Hi Tom, > >I implemented 'log2' modifier on top of your v11 patchset. Could you >please take a look at this? Ah, this seems very useful :) Reviewed-by: Masami Hiramatsu -- Masami > > > >>From 5fc74778b9af5e4e121a0563fb8e54e8f495ca29 Mon Sep 17 00:00:00 2001 >From: Namhyung Kim >Date: Thu, 5 Nov 2015 23:34:05 +0900 >Subject: [PATCH] tracing: Add hist trigger 'log2' modifier > >Allow users to have numeric fields displayed as log2 values in case >value range is very wide by appending '.log2' to field names. > >For example, > > # echo 'hist:key=bytes_req' > kmalloc/trigger > # cat kmalloc/hist > > { bytes_req: 504 } hitcount: 1 > { bytes_req: 11 } hitcount: 1 > { bytes_req: 104 } hitcount: 1 > { bytes_req: 48 } hitcount: 1 > { bytes_req: 2048 } hitcount: 1 > { bytes_req: 4096 } hitcount: 1 > { bytes_req: 240 } hitcount: 1 > { bytes_req: 392 } hitcount: 1 > { bytes_req: 13 } hitcount: 1 > { bytes_req: 28 } hitcount: 1 > { bytes_req: 12 } hitcount: 1 > { bytes_req: 64 } hitcount: 2 > { bytes_req: 128 } hitcount: 2 > { bytes_req: 32 } hitcount: 2 > { bytes_req: 8 } hitcount: 11 > { bytes_req: 10 } hitcount: 13 > { bytes_req: 24 } hitcount: 25 > { bytes_req: 160 } hitcount: 29 > { bytes_req: 16 } hitcount: 33 > { bytes_req: 80 } hitcount: 36 > >When using '.log2' modifier, the output looks like: > > # echo 'hist:key=bytes_req.log2' > kmalloc/trigger > # cat kmalloc/hist > > { bytes_req: ~ 2^12 } hitcount: 1 > { bytes_req: ~ 2^11 } hitcount: 1 > { bytes_req: ~ 2^9 } hitcount: 2 > { bytes_req: ~ 2^6 } hitcount: 3 > { bytes_req: ~ 2^3 } hitcount: 13 > { bytes_req: ~ 2^5 } hitcount: 19 > { bytes_req: ~ 2^8 } hitcount: 49 > { bytes_req: ~ 2^7 } hitcount: 57 > { bytes_req: ~ 2^4 } hitcount: 74 > >Cc: Tom Zanussi >Cc: Masami Hiramatsu >Signed-off-by: Namhyung Kim >--- > kernel/trace/trace.c | 1 + > kernel/trace/trace_events_hist.c | 18 ++++++++++++++++++ > 2 files changed, 19 insertions(+) > >diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c >index 74f95745acbc..542486468707 100644 >--- a/kernel/trace/trace.c >+++ b/kernel/trace/trace.c >@@ -3837,6 +3837,7 @@ static const char readme_msg[] = > "\t .sym-offset display an address as a symbol and offset\n" > "\t .execname display a common_pid as a program name\n" > "\t .syscall display a syscall id as a syscall name\n\n" >+ "\t .log2 display log2 value rather than raw number\n\n" > "\t The 'pause' parameter can be used to pause an existing hist\n" > "\t trigger or to start a hist trigger but not log any events\n" > "\t until told to do so. 'continue' can be used to start or\n" >diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c >index b040ebefcd64..20a17fdb3fe6 100644 >--- a/kernel/trace/trace_events_hist.c >+++ b/kernel/trace/trace_events_hist.c >@@ -68,6 +68,13 @@ static u64 hist_field_pstring(struct hist_field *hist_field, void *event) > return (u64)(unsigned long)*addr; > } > >+static u64 hist_field_log2(struct hist_field *hist_field, void *event) >+{ >+ u64 val = *(u64 *)(event + hist_field->field->offset); >+ >+ return (u64) ilog2(roundup_pow_of_two(val)); >+} >+ > #define DEFINE_HIST_FIELD_FN(type) \ > static u64 hist_field_##type(struct hist_field *hist_field, void *event)\ > { \ >@@ -103,6 +110,7 @@ enum hist_field_flags { > HIST_FIELD_EXECNAME = 64, > HIST_FIELD_SYSCALL = 128, > HIST_FIELD_STACKTRACE = 256, >+ HIST_FIELD_LOG2 = 512, > }; > > struct hist_trigger_attrs { >@@ -349,6 +357,11 @@ static struct hist_field *create_hist_field(struct ftrace_event_field *field, > goto out; > } > >+ if (flags & HIST_FIELD_LOG2) { >+ hist_field->fn = hist_field_log2; >+ goto out; >+ } >+ > if (is_string_field(field)) { > flags |= HIST_FIELD_STRING; > >@@ -500,6 +513,8 @@ static int create_key_field(struct hist_trigger_data *hist_data, > flags |= HIST_FIELD_EXECNAME; > else if (!strcmp(field_str, "syscall")) > flags |= HIST_FIELD_SYSCALL; >+ else if (!strcmp(field_str, "log2")) >+ flags |= HIST_FIELD_LOG2; > else { > ret = -EINVAL; > goto out; >@@ -942,6 +957,9 @@ hist_trigger_entry_print(struct seq_file *m, > key + key_field->offset, > HIST_STACKTRACE_DEPTH); > multiline = true; >+ } else if (key_field->flags & HIST_FIELD_LOG2) { >+ seq_printf(m, "%s: ~ 2^%-2llu", key_field->field->name, >+ *(u64 *)(key + key_field->offset)); > } else if (key_field->flags & HIST_FIELD_STRING) { > seq_printf(m, "%s: %-50s", key_field->field->name, > (char *)(key + key_field->offset)); >-- >2.6.2 {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I