From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933017AbdJ3Uxo (ORCPT ); Mon, 30 Oct 2017 16:53:44 -0400 Received: from mga02.intel.com ([134.134.136.20]:20724 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932975AbdJ3Uxi (ORCPT ); Mon, 30 Oct 2017 16:53:38 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,321,1505804400"; d="scan'208";a="329769737" From: Tom Zanussi To: rostedt@goodmis.org Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org, vedang.patel@intel.com, bigeasy@linutronix.de, joel.opensrc@gmail.com, joelaf@google.com, mathieu.desnoyers@efficios.com, baohong.liu@intel.com, rajvi.jingar@intel.com, julia@ni.com, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Tom Zanussi Subject: [PATCH v4 19/37] tracing: Generalize per-element hist trigger data Date: Mon, 30 Oct 2017 15:52:01 -0500 Message-Id: X-Mailer: git-send-email 1.9.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Up until now, hist triggers only needed per-element support for saving 'comm' data, which was saved directly as a private data pointer. In anticipation of the need to save other data besides 'comm', add a new hist_elt_data struct for the purpose, and switch the current 'comm'-related code over to that. Signed-off-by: Tom Zanussi --- kernel/trace/trace_events_hist.c | 76 +++++++++++++++++++++++----------------- 1 file changed, 43 insertions(+), 33 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 0eec597..4055187 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -247,6 +247,10 @@ static u64 hist_field_timestamp(struct hist_field *hist_field, void *event, return ts; } +struct hist_elt_data { + char *comm; +}; + static const char *hist_field_name(struct hist_field *field, unsigned int level) { @@ -461,45 +465,61 @@ static inline void save_comm(char *comm, struct task_struct *task) memcpy(comm, task->comm, TASK_COMM_LEN); } -static void hist_trigger_elt_comm_free(struct tracing_map_elt *elt) +static void hist_elt_data_free(struct hist_elt_data *elt_data) +{ + kfree(elt_data->comm); + kfree(elt_data); +} + +static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) { - kfree((char *)elt->private_data); + struct hist_elt_data *elt_data = elt->private_data; + + hist_elt_data_free(elt_data); } -static int hist_trigger_elt_comm_alloc(struct tracing_map_elt *elt) +static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) { struct hist_trigger_data *hist_data = elt->map->private_data; + unsigned int size = TASK_COMM_LEN + 1; + struct hist_elt_data *elt_data; struct hist_field *key_field; unsigned int i; + elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); + if (!elt_data) + return -ENOMEM; + for_each_hist_key_field(i, hist_data) { key_field = hist_data->fields[i]; if (key_field->flags & HIST_FIELD_FL_EXECNAME) { - unsigned int size = TASK_COMM_LEN + 1; - - elt->private_data = kzalloc(size, GFP_KERNEL); - if (!elt->private_data) + elt_data->comm = kzalloc(size, GFP_KERNEL); + if (!elt_data->comm) { + kfree(elt_data); return -ENOMEM; + } break; } } + elt->private_data = elt_data; + return 0; } -static void hist_trigger_elt_comm_init(struct tracing_map_elt *elt) +static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) { - char *comm = elt->private_data; + struct hist_elt_data *elt_data = elt->private_data; - if (comm) - save_comm(comm, current); + if (elt_data->comm) + save_comm(elt_data->comm, current); } -static const struct tracing_map_ops hist_trigger_elt_comm_ops = { - .elt_alloc = hist_trigger_elt_comm_alloc, - .elt_free = hist_trigger_elt_comm_free, - .elt_init = hist_trigger_elt_comm_init, +static const struct tracing_map_ops hist_trigger_elt_data_ops = { + .elt_alloc = hist_trigger_elt_data_alloc, + .elt_free = hist_trigger_elt_data_free, + .elt_init = hist_trigger_elt_data_init, }; static const char *get_hist_field_flags(struct hist_field *hist_field) @@ -1507,21 +1527,6 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data) return 0; } -static bool need_tracing_map_ops(struct hist_trigger_data *hist_data) -{ - struct hist_field *key_field; - unsigned int i; - - for_each_hist_key_field(i, hist_data) { - key_field = hist_data->fields[i]; - - if (key_field->flags & HIST_FIELD_FL_EXECNAME) - return true; - } - - return false; -} - static struct hist_trigger_data * create_hist_data(unsigned int map_bits, struct hist_trigger_attrs *attrs, @@ -1547,8 +1552,7 @@ static bool need_tracing_map_ops(struct hist_trigger_data *hist_data) if (ret) goto free; - if (need_tracing_map_ops(hist_data)) - map_ops = &hist_trigger_elt_comm_ops; + map_ops = &hist_trigger_elt_data_ops; hist_data->map = tracing_map_create(map_bits, hist_data->key_size, map_ops, hist_data); @@ -1736,7 +1740,13 @@ static void hist_trigger_stacktrace_print(struct seq_file *m, seq_printf(m, "%s: [%llx] %-55s", field_name, uval, str); } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { - char *comm = elt->private_data; + struct hist_elt_data *elt_data = elt->private_data; + char *comm; + + if (WARN_ON_ONCE(!elt_data)) + return; + + comm = elt_data->comm; uval = *(u64 *)(key + key_field->offset); seq_printf(m, "%s: %-16s[%10llu]", field_name, -- 1.9.3