forked from Minki/linux
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>
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@ -407,6 +407,30 @@ out_err:
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goto out_put;
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}
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/*
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* Front-end cache - TID lookups come in blocks,
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* so most of the time we dont have to look up
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* the full rbtree:
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*/
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static struct thread*
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threads__get_last_match(struct threads *threads, struct machine *machine,
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int pid, int tid)
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{
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struct thread *th;
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th = threads->last_match;
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if (th != NULL) {
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if (th->tid == tid) {
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machine__update_thread_pid(machine, th, pid);
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return thread__get(th);
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}
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threads->last_match = NULL;
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}
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return NULL;
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}
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/*
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* Caller must eventually drop thread->refcnt returned with a successful
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* lookup/new thread inserted.
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@ -420,20 +444,9 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
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struct rb_node *parent = NULL;
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struct thread *th;
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/*
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* Front-end cache - TID lookups come in blocks,
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* so most of the time we dont have to look up
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* the full rbtree:
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*/
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th = threads->last_match;
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if (th != NULL) {
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if (th->tid == tid) {
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machine__update_thread_pid(machine, th, pid);
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return thread__get(th);
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}
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threads->last_match = NULL;
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}
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th = threads__get_last_match(threads, machine, pid, tid);
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if (th)
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return th;
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while (*p != NULL) {
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parent = *p;
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