From patchwork Tue Aug 3 04:23:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 491248 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 F1379C4320A for ; Tue, 3 Aug 2021 04:24:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD9E261159 for ; Tue, 3 Aug 2021 04:24:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234027AbhHCEYl (ORCPT ); Tue, 3 Aug 2021 00:24:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:57184 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233720AbhHCEYI (ORCPT ); Tue, 3 Aug 2021 00:24:08 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 52202611CC; Tue, 3 Aug 2021 04:23:57 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.94.2) (envelope-from ) id 1mAly8-002qo1-8x; Tue, 03 Aug 2021 00:23:56 -0400 From: Steven Rostedt To: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Tom Zanussi , Daniel Bristot de Oliveira , Masami Hiramatsu , Namhyung Kim , linux-rt-users , Clark Williams , "Steven Rostedt (VMware)" Subject: [PATCH v2 21/21] libtracefs: Add CAST(x AS _COUNTER_) syntax to create values in histograms Date: Tue, 3 Aug 2021 00:23:47 -0400 Message-Id: <20210803042347.679499-22-rostedt@goodmis.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210803042347.679499-1-rostedt@goodmis.org> References: <20210803042347.679499-1-rostedt@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org From: "Steven Rostedt (VMware)" Use the CAST() command of SQL to define which items in the select should be cast as values and not keys. By casting the field as the special value _COUNTER_, it will turn the selection item into a value. For example: SELECT common_pid, CAST(bytes_req AS _COUNTER_) FROM kmalloc Will create: echo 'hist:keys=common_pid:vals=bytes_req' > events/kmem/kmalloc/trigger Signed-off-by: Steven Rostedt (VMware) --- Documentation/libtracefs-sql.txt | 24 ++++++++++++++++++++++++ include/tracefs-local.h | 2 ++ include/tracefs.h | 3 +++ src/tracefs-hist.c | 28 ++++++++++++++++++++++++++-- src/tracefs-sqlhist.c | 23 +++++++++++++++++++++++ 5 files changed, 78 insertions(+), 2 deletions(-) diff --git a/Documentation/libtracefs-sql.txt b/Documentation/libtracefs-sql.txt index 314f607fa84e..7b616fa27d23 100644 --- a/Documentation/libtracefs-sql.txt +++ b/Documentation/libtracefs-sql.txt @@ -238,6 +238,30 @@ name of the process. *LOG* or *LOG2* - bucket the key values in a log 2 values (1, 2, 3-4, 5-8, 9-16, 17-32, ...) +The above fields are not case sensitive, and "LOG2" works as good as "log". + +A special CAST to _COUNTER_ or __COUNTER__ will make the field a value and not +a key. For example: + +[source,c] +-- + SELECT common_pid, CAST(bytes_req AS _COUNTER_) FROM kmalloc +-- + +Which will create + +[source,c] +-- + echo 'hist:keys=common_pid:vals=bytes_req' > events/kmem/kmalloc/trigger + + cat events/kmem/kmalloc/hist + +{ common_pid: 1812 } hitcount: 1 bytes_req: 32 +{ common_pid: 9111 } hitcount: 2 bytes_req: 272 +{ common_pid: 1768 } hitcount: 3 bytes_req: 1112 +{ common_pid: 0 } hitcount: 4 bytes_req: 512 +{ common_pid: 18297 } hitcount: 11 bytes_req: 2004 +-- RETURN VALUE ------------ diff --git a/include/tracefs-local.h b/include/tracefs-local.h index 07d40b2fae4f..684eccffafee 100644 --- a/include/tracefs-local.h +++ b/include/tracefs-local.h @@ -88,6 +88,8 @@ int trace_append_filter(char **filter, unsigned int *state, struct tracefs_synth *synth_init_from(struct tep_handle *tep, const char *start_system, const char *start_event); + +#define HIST_COUNTER_TYPE (TRACEFS_HIST_KEY_MAX + 100) int synth_add_start_field(struct tracefs_synth *synth, const char *start_field, const char *name, diff --git a/include/tracefs.h b/include/tracefs.h index 219adba4b0ce..17020de0108a 100644 --- a/include/tracefs.h +++ b/include/tracefs.h @@ -264,6 +264,7 @@ enum tracefs_hist_key_type { TRACEFS_HIST_KEY_EXECNAME, TRACEFS_HIST_KEY_LOG, TRACEFS_HIST_KEY_USECS, + TRACEFS_HIST_KEY_MAX }; enum tracefs_hist_sort_direction { @@ -275,6 +276,8 @@ enum tracefs_hist_sort_direction { #define TRACEFS_HIST_TIMESTAMP_USECS "common_timestamp.usecs" #define TRACEFS_HIST_CPU "cpu" +#define TRACEFS_HIST_COUNTER "__COUNTER__" + #define TRACEFS_HIST_HITCOUNT "hitcount" struct tracefs_hist; diff --git a/src/tracefs-hist.c b/src/tracefs-hist.c index d62422399552..c3aecf9a8fef 100644 --- a/src/tracefs-hist.c +++ b/src/tracefs-hist.c @@ -256,7 +256,7 @@ int tracefs_hist_add_key(struct tracefs_hist *hist, const char *key, bool use_key = false; char *key_type = NULL; char **new_list; - int ret; + int ret = -1; switch (type) { case TRACEFS_HIST_KEY_NORMAL: @@ -284,6 +284,9 @@ int tracefs_hist_add_key(struct tracefs_hist *hist, const char *key, case TRACEFS_HIST_KEY_USECS: ret = asprintf(&key_type, "%s.usecs", key); break; + case TRACEFS_HIST_KEY_MAX: + /* error */ + break; } if (ret < 0) @@ -1450,6 +1453,9 @@ tracefs_synth_get_start_hist(struct tracefs_synth *synth) for (i = 0; keys[i]; i++) { int type = types ? types[i] : 0; + if (type == HIST_COUNTER_TYPE) + continue; + key = keys[i]; if (i) { @@ -1466,7 +1472,25 @@ tracefs_synth_get_start_hist(struct tracefs_synth *synth) } } - if (hist && synth->start_filter) { + if (!hist) + return NULL; + + for (i = 0; keys[i]; i++) { + int type = types ? types[i] : 0; + + if (type != HIST_COUNTER_TYPE) + continue; + + key = keys[i]; + + ret = tracefs_hist_add_value(hist, key); + if (ret < 0) { + tracefs_hist_free(hist); + return NULL; + } + } + + if (synth->start_filter) { hist->filter = strdup(synth->start_filter); if (!hist->filter) { tracefs_hist_free(hist); diff --git a/src/tracefs-sqlhist.c b/src/tracefs-sqlhist.c index 88563e98f298..1a3cf37c84ba 100644 --- a/src/tracefs-sqlhist.c +++ b/src/tracefs-sqlhist.c @@ -1253,6 +1253,17 @@ static int verify_field_type(struct tep_handle *tep, if (!type) return -1; + if (!strcmp(type, TRACEFS_HIST_COUNTER) || + !strcmp(type, "_COUNTER_")) { + ret = HIST_COUNTER_TYPE; + if (tfield->flags & (TEP_FIELD_IS_STRING | TEP_FIELD_IS_ARRAY)) { + parse_error(sb, field->raw, + "'%s' is a string, and counters may only be used with numbers\n"); + ret = -1; + } + goto out; + } + for (i = 0; type[i]; i++) type[i] = tolower(type[i]); @@ -1292,6 +1303,7 @@ static int verify_field_type(struct tep_handle *tep, field->raw, type); ret = -1; } + out: free(type); return ret; fail_type: @@ -1319,6 +1331,7 @@ static struct tracefs_synth *build_synth(struct tep_handle *tep, const char *end_match; bool started_start = false; bool started_end = false; + bool non_val = false; int ret; if (!table->from) @@ -1396,6 +1409,8 @@ static struct tracefs_synth *build_synth(struct tep_handle *tep, type = verify_field_type(tep, table->sb, expr); if (type < 0) goto free; + if (type != HIST_COUNTER_TYPE) + non_val = true; ret = synth_add_start_field(synth, field->field, field->label, type); @@ -1426,6 +1441,14 @@ static struct tracefs_synth *build_synth(struct tep_handle *tep, } } + if (!non_val && !table->to) { + table->sb->line_no = 0; + table->sb->line_idx = 10; + parse_error(table->sb, "CAST", + "Not all SELECT items can be of type _COUNTER_\n"); + goto free; + } + for (expr = table->where; expr; expr = expr->next) { const char *filter_system = NULL; const char *filter_event = NULL;