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Update get_sched_policy to return TOP_APP correctly. 

Currently get_sched_policy() would only return foreground
or background, but not TOP_APP, since it's not looking
at CPUsets at all.

Fixing this makes testing easier, and it also corrects
the output of "ps -P" to show "ta" for current top app.

Bug: 27857142
Change-Id: I589cacc107f355de15750f01b06f404b59a0f99b
This commit is contained in:
Martijn Coenen 2016-04-04 17:11:56 +02:00
parent 1ab87e7712
commit 7b173a148b
1 changed files with 24 additions and 7 deletions
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31
libcutils/sched_policy.c
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@ -148,7 +148,7 @@ static void __initialize(void) {
}
/*
* Try to get the scheduler group.
* Returns the path under the requested cgroup subsystem (if it exists)
*
* The data from /proc/<pid>/cgroup looks (something) like:
* 2:cpu:/bg_non_interactive
@ -158,7 +158,7 @@ static void __initialize(void) {
* the default cgroup. If the string is longer than "bufLen", the string
* will be truncated.
*/
static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
static int getCGroupSubsys(int tid, const char* subsys, char* buf, size_t bufLen)
{
#if defined(__ANDROID__)
char pathBuf[32];
@ -172,7 +172,7 @@ static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) {
char *next = lineBuf;
char *subsys;
char *found_subsys;
char *grp;
size_t len;
@ -181,11 +181,11 @@ static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
goto out_bad_data;
}
if (!(subsys = strsep(&next, ":"))) {
if (!(found_subsys = strsep(&next, ":"))) {
goto out_bad_data;
}
if (strcmp(subsys, "cpu")) {
if (strcmp(found_subsys, subsys)) {
/* Not the subsys we're looking for */
continue;
}
@ -206,7 +206,7 @@ static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
return 0;
}
SLOGE("Failed to find cpu subsys");
SLOGE("Failed to find subsys %s", subsys);
fclose(fp);
return -1;
out_bad_data:
@ -228,7 +228,23 @@ int get_sched_policy(int tid, SchedPolicy *policy)
if (__sys_supports_schedgroups) {
char grpBuf[32];
if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0)
#ifdef USE_CPUSETS
if (getCGroupSubsys(tid, "cpuset", grpBuf, sizeof(grpBuf)) < 0)
return -1;
if (grpBuf[0] == '\0') {
*policy = SP_FOREGROUND;
} else if (!strcmp(grpBuf, "foreground")) {
*policy = SP_FOREGROUND;
} else if (!strcmp(grpBuf, "background")) {
*policy = SP_BACKGROUND;
} else if (!strcmp(grpBuf, "top-app")) {
*policy = SP_TOP_APP;
} else {
errno = ERANGE;
return -1;
}
#else
if (getCGroupSubsys(tid, "cpu", grpBuf, sizeof(grpBuf)) < 0)
return -1;
if (grpBuf[0] == '\0') {
*policy = SP_FOREGROUND;
@ -238,6 +254,7 @@ int get_sched_policy(int tid, SchedPolicy *policy)
errno = ERANGE;
return -1;
}
#endif
} else {
int rc = sched_getscheduler(tid);
if (rc < 0)