From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753449Ab1HDKIr (ORCPT ); Thu, 4 Aug 2011 06:08:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39569 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753008Ab1HDKIc (ORCPT ); Thu, 4 Aug 2011 06:08:32 -0400 From: Jiri Olsa To: rostedt@goodmis.org, fweisbec@gmail.com, mingo@redhat.com Cc: linux-kernel@vger.kernel.org, Jiri Olsa Subject: [PATCH 01/10] tracing/filter: Use static allocation for filter predicates Date: Thu, 4 Aug 2011 12:08:17 +0200 Message-Id: <1312452506-5100-2-git-send-email-jolsa@redhat.com> In-Reply-To: <1312452506-5100-1-git-send-email-jolsa@redhat.com> References: <1312452506-5100-1-git-send-email-jolsa@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Don't dynamically allocate filter_pred struct, use static memory. This way we can get rid of the code managing the dynamic filter_pred struct object. The create_pred function integrates create_logical_pred function. This way the static predicate memory is returned only from one place. Signed-off-by: Jiri Olsa --- kernel/trace/trace_events_filter.c | 57 ++++++++++-------------------------- 1 files changed, 16 insertions(+), 41 deletions(-) diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 256764e..cb295a1 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -630,11 +630,7 @@ find_event_field(struct ftrace_event_call *call, char *name) static void filter_free_pred(struct filter_pred *pred) { - if (!pred) - return; - kfree(pred->field_name); - kfree(pred); } static void filter_clear_pred(struct filter_pred *pred) @@ -1302,39 +1298,30 @@ parse_operand: return 0; } -static struct filter_pred *create_pred(int op, char *operand1, char *operand2) +static struct filter_pred *create_pred(struct filter_parse_state *ps, + int op, char *operand1, char *operand2) { - struct filter_pred *pred; + static struct filter_pred pred; - pred = kzalloc(sizeof(*pred), GFP_KERNEL); - if (!pred) - return NULL; + memset(&pred, 0, sizeof(pred)); + pred.op = op; - pred->field_name = kstrdup(operand1, GFP_KERNEL); - if (!pred->field_name) { - kfree(pred); + if (op == OP_AND || op == OP_OR) + return &pred; + + if (!operand1 || !operand2) { + parse_error(ps, FILT_ERR_MISSING_FIELD, 0); return NULL; } - strcpy(pred->regex.pattern, operand2); - pred->regex.len = strlen(pred->regex.pattern); - - pred->op = op; - - return pred; -} - -static struct filter_pred *create_logical_pred(int op) -{ - struct filter_pred *pred; - - pred = kzalloc(sizeof(*pred), GFP_KERNEL); - if (!pred) + pred.field_name = kstrdup(operand1, GFP_KERNEL); + if (!pred.field_name) return NULL; - pred->op = op; + strcpy(pred.regex.pattern, operand2); + pred.regex.len = strlen(pred.regex.pattern); - return pred; + return &pred; } static int check_preds(struct filter_parse_state *ps) @@ -1643,19 +1630,7 @@ static int replace_preds(struct ftrace_event_call *call, goto fail; } - if (elt->op == OP_AND || elt->op == OP_OR) { - pred = create_logical_pred(elt->op); - goto add_pred; - } - - if (!operand1 || !operand2) { - parse_error(ps, FILT_ERR_MISSING_FIELD, 0); - err = -EINVAL; - goto fail; - } - - pred = create_pred(elt->op, operand1, operand2); -add_pred: + pred = create_pred(ps, elt->op, operand1, operand2); if (!pred) { err = -ENOMEM; goto fail; -- 1.7.1