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Refine set_sched_policy behavior

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If a thread priority is greater than or equal to
ANDROID_PRIORITY_BACKGROUND, and the new priority is less than
ANDROID_PRIORITY_BACKGROUND, set the sched policy to its parent process.

Bug: 139521784
Test: functionality verified
Change-Id: Ie6fe33e08e4fda0a119b9869e8dd1733c164d79e
This commit is contained in:
Rick Yiu 2019-12-26 19:35:03 +08:00
parent cb1a8e7fdd
commit f7f4442176
1 changed files with 21 additions and 7 deletions
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28
libutils/Threads.cpp
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@ -18,8 +18,8 @@
#define LOG_TAG "libutils.threads"
#include <assert.h>
#include <utils/Thread.h>
#include <utils/AndroidThreads.h>
#include <utils/Thread.h>
#if !defined(_WIN32)
# include <sys/resource.h>
@ -36,7 +36,10 @@
#include <utils/Log.h>
#if defined(__ANDROID__)
#include <processgroup/processgroup.h>
#include <processgroup/sched_policy.h>
#endif
#if defined(__ANDROID__)
# define __android_unused
@ -64,6 +67,7 @@ using namespace android;
typedef void* (*android_pthread_entry)(void*);
#if defined(__ANDROID__)
struct thread_data_t {
thread_func_t entryFunction;
void* userData;
@ -79,10 +83,11 @@ struct thread_data_t {
char * name = t->threadName;
delete t;
setpriority(PRIO_PROCESS, 0, prio);
// A new thread will be in its parent's sched group by default,
// so we just need to handle the background case.
if (prio >= ANDROID_PRIORITY_BACKGROUND) {
set_sched_policy(0, SP_BACKGROUND);
} else {
set_sched_policy(0, SP_FOREGROUND);
SetTaskProfiles(0, {"SCHED_SP_BACKGROUND"}, true);
}
if (name) {
@ -92,6 +97,7 @@ struct thread_data_t {
return f(u);
}
};
#endif
void androidSetThreadName(const char* name) {
#if defined(__linux__)
@ -300,11 +306,19 @@ int androidSetThreadPriority(pid_t tid, int pri)
{
int rc = 0;
int lasterr = 0;
int curr_pri = getpriority(PRIO_PROCESS, tid);
if (curr_pri == pri) {
return rc;
}
if (pri >= ANDROID_PRIORITY_BACKGROUND) {
rc = set_sched_policy(tid, SP_BACKGROUND);
} else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) {
rc = set_sched_policy(tid, SP_FOREGROUND);
rc = SetTaskProfiles(tid, {"SCHED_SP_BACKGROUND"}, true) ? 0 : -1;
} else if (curr_pri >= ANDROID_PRIORITY_BACKGROUND) {
SchedPolicy policy = SP_FOREGROUND;
// Change to the sched policy group of the process.
get_sched_policy(getpid(), &policy);
rc = SetTaskProfiles(tid, {get_sched_policy_profile_name(policy)}, true) ? 0 : -1;
}
if (rc) {