From: kan.liang@intel.com
To: acme@kernel.org, peterz@infradead.org, mingo@redhat.com,
linux-kernel@vger.kernel.org
Cc: jolsa@kernel.org, namhyung@kernel.org, adrian.hunter@intel.com,
lukasz.odzioba@intel.com, ak@linux.intel.com,
Kan Liang <kan.liang@intel.com>
Subject: [PATCH RFC 07/10] perf tools: change machine comm_exec type to atomic
Date: Thu, 7 Sep 2017 10:55:51 -0700 [thread overview]
Message-ID: <1504806954-150842-8-git-send-email-kan.liang@intel.com> (raw)
In-Reply-To: <1504806954-150842-1-git-send-email-kan.liang@intel.com>
From: Kan Liang <kan.liang@intel.com>
In case there are two or more threads want to change it.
Signed-off-by: Kan Liang <kan.liang@intel.com>
---
tools/perf/util/machine.c | 11 ++++++-----
tools/perf/util/machine.h | 2 +-
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 5e451f9..f568c22 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -64,8 +64,8 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
machine->id_hdr_size = 0;
machine->kptr_restrict_warned = false;
- machine->comm_exec = false;
machine->kernel_start = 0;
+ atomic_set(&machine->comm_exec, 0);
memset(machine->vmlinux_maps, 0, sizeof(machine->vmlinux_maps));
@@ -238,14 +238,15 @@ struct machine *machines__add(struct machines *machines, pid_t pid,
void machines__set_comm_exec(struct machines *machines, bool comm_exec)
{
+ int exec = comm_exec ? 1 : 0;
struct rb_node *nd;
- machines->host.comm_exec = comm_exec;
+ atomic_set(&machines->host.comm_exec, exec);
for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
struct machine *machine = rb_entry(nd, struct machine, rb_node);
- machine->comm_exec = comm_exec;
+ atomic_set(&machine->comm_exec, exec);
}
}
@@ -505,7 +506,7 @@ struct thread *machine__find_thread(struct machine *machine, pid_t pid,
struct comm *machine__thread_exec_comm(struct machine *machine,
struct thread *thread)
{
- if (machine->comm_exec)
+ if (atomic_read(&machine->comm_exec))
return thread__exec_comm(thread);
else
return thread__comm(thread);
@@ -521,7 +522,7 @@ int machine__process_comm_event(struct machine *machine, union perf_event *event
int err = 0;
if (exec)
- machine->comm_exec = true;
+ atomic_set(&machine->comm_exec, 1);
if (dump_trace)
perf_event__fprintf_comm(event, stdout);
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 745a0ca..ec9a47a 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -38,7 +38,7 @@ struct machine {
struct rb_node rb_node;
pid_t pid;
u16 id_hdr_size;
- bool comm_exec;
+ atomic_t comm_exec;
bool kptr_restrict_warned;
char *root_dir;
struct machine_th threads[MACHINE_TH_TABLE_SIZE];
--
2.5.5
next prev parent reply other threads:[~2017-09-07 17:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-07 17:55 [PATCH RFC 00/10] perf top optimization kan.liang
2017-09-07 17:55 ` [PATCH RFC 01/10] perf tools: hashtable for machine threads kan.liang
2017-09-08 14:18 ` Arnaldo Carvalho de Melo
2017-09-07 17:55 ` [PATCH RFC 02/10] perf tools: using scandir to replace readdir kan.liang
2017-09-08 14:11 ` Arnaldo Carvalho de Melo
2017-09-22 16:35 ` [tip:perf/core] perf tools: Use scandir() to replace readdir() tip-bot for Kan Liang
2017-09-07 17:55 ` [PATCH RFC 03/10] petf tools: using comm_str to replace comm in hist_entry kan.liang
2017-09-07 17:55 ` [PATCH RFC 04/10] petf tools: introduce a new function to set namespaces id kan.liang
2017-09-07 17:55 ` [PATCH RFC 05/10] perf tools: lock to protect thread list kan.liang
2017-09-07 17:55 ` [PATCH RFC 06/10] perf tools: lock to protect comm_str rb tree kan.liang
2017-09-08 14:27 ` Arnaldo Carvalho de Melo
2017-09-07 17:55 ` kan.liang [this message]
2017-09-07 17:55 ` [PATCH RFC 08/10] perf top: implement multithreading for perf_event__synthesize_threads kan.liang
2017-09-07 17:55 ` [PATCH RFC 09/10] perf top: add option to set the number of thread for event synthesize kan.liang
2017-09-07 17:55 ` [PATCH RFC 10/10] perf top: switch back to overwrite mode kan.liang
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