diff options
| author |   Adrian Hunter <adrian.hunter@intel.com> | 2021-02-18 11:57:56 +0200 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-02-18 16:14:33 -0300 |
| commit | 3035cb6cbd2d62a764fa451ed9534eafdd0b446c (patch) | |
| tree | 4b7fc4f6d8eee83223cd9214909d6bab7d422459 /tools/perf/util/session.c | |
| parent | perf machine: Factor out machines__find_guest() (diff) | |
| download | linux-dev-3035cb6cbd2d62a764fa451ed9534eafdd0b446c.tar.xz linux-dev-3035cb6cbd2d62a764fa451ed9534eafdd0b446c.zip | |
perf machine: Factor out machine__idle_thread()
Factor out machine__idle_thread() so it can be re-used for guest machines.
A thread is needed to find executable code, even for the guest kernel. To
avoid possible future pid number conflicts, the idle thread can be used.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210218095801.19576-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/util/session.c | 25 |
1 files changed, 3 insertions, 22 deletions
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 7b0d0c9e3dd1..859832a82496 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1789,32 +1789,13 @@ struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) return machine__findnew_thread(&session->machines.host, -1, pid); } -/* - * Threads are identified by pid and tid, and the idle task has pid == tid == 0. - * So here a single thread is created for that, but actually there is a separate - * idle task per cpu, so there should be one 'struct thread' per cpu, but there - * is only 1. That causes problems for some tools, requiring workarounds. For - * example get_idle_thread() in builtin-sched.c, or thread_stack__per_cpu(). - */ int perf_session__register_idle_thread(struct perf_session *session) { - struct thread *thread; - int err = 0; - - thread = machine__findnew_thread(&session->machines.host, 0, 0); - if (thread == NULL || thread__set_comm(thread, "swapper", 0)) { - pr_err("problem inserting idle task.\n"); - err = -1; - } + struct thread *thread = machine__idle_thread(&session->machines.host); - if (thread == NULL || thread__set_namespaces(thread, 0, NULL)) { - pr_err("problem inserting idle task.\n"); - err = -1; - } - - /* machine__findnew_thread() got the thread, so put it */ + /* machine__idle_thread() got the thread, so put it */ thread__put(thread); - return err; + return thread ? 0 : -1; } static void |