Commit f8b2ebb5 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo

perf machine: Add threads__get_last_match function

Separating threads::last_match cache read/check into separate
threads__get_last_match function. This will be useful in following
patch.
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Lukasz Odzioba <lukasz.odzioba@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20180719143345.12963-2-jolsa@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e8fedff1
......@@ -408,23 +408,16 @@ static void machine__update_thread_pid(struct machine *machine,
}
/*
* Caller must eventually drop thread->refcnt returned with a successful
* lookup/new thread inserted.
* Front-end cache - TID lookups come in blocks,
* so most of the time we dont have to look up
* the full rbtree:
*/
static struct thread *____machine__findnew_thread(struct machine *machine,
struct threads *threads,
pid_t pid, pid_t tid,
bool create)
static struct thread*
threads__get_last_match(struct threads *threads, struct machine *machine,
int pid, int tid)
{
struct rb_node **p = &threads->entries.rb_node;
struct rb_node *parent = NULL;
struct thread *th;
/*
* Front-end cache - TID lookups come in blocks,
* so most of the time we dont have to look up
* the full rbtree:
*/
th = threads->last_match;
if (th != NULL) {
if (th->tid == tid) {
......@@ -435,6 +428,26 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
threads->last_match = NULL;
}
return NULL;
}
/*
* Caller must eventually drop thread->refcnt returned with a successful
* lookup/new thread inserted.
*/
static struct thread *____machine__findnew_thread(struct machine *machine,
struct threads *threads,
pid_t pid, pid_t tid,
bool create)
{
struct rb_node **p = &threads->entries.rb_node;
struct rb_node *parent = NULL;
struct thread *th;
th = threads__get_last_match(threads, machine, pid, tid);
if (th)
return th;
while (*p != NULL) {
parent = *p;
th = rb_entry(parent, struct thread, rb_node);
......
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