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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: Jiri 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.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-07-19 16:33:42 +02:00 committed by Arnaldo Carvalho de Melo
parent e8fedff1cc
commit f8b2ebb532
1 changed files with 27 additions and 14 deletions
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41
tools/perf/util/machine.c
View File

@ -407,6 +407,30 @@ static void machine__update_thread_pid(struct machine *machine,
goto out_put;
}
/*
* 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*
threads__get_last_match(struct threads *threads, struct machine *machine,
int pid, int tid)
{
struct thread *th;
th = threads->last_match;
if (th != NULL) {
if (th->tid == tid) {
machine__update_thread_pid(machine, th, pid);
return thread__get(th);
}
threads->last_match = NULL;
}
return NULL;
}
/*
* Caller must eventually drop thread->refcnt returned with a successful
* lookup/new thread inserted.
@ -420,20 +444,9 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
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) {
machine__update_thread_pid(machine, th, pid);
return thread__get(th);
}
threads->last_match = NULL;
}
th = threads__get_last_match(threads, machine, pid, tid);
if (th)
return th;
while (*p != NULL) {
parent = *p;