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Enable top-app cpuset support.

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Allows ActivityManager to use the top-app cpuset to grant the currently
focused app exclusive access to a CPU core.

Change-Id: I45bca5170477e413dec6e5889338399d0859706c
This commit is contained in:
Tim Murray 2016-01-11 16:16:35 -08:00
parent da870abcf4
commit 6647bb5130
3 changed files with 18 additions and 0 deletions
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1
include/cutils/sched_policy.h
View file

@ -29,6 +29,7 @@ typedef enum {
SP_SYSTEM = 2, // can't be used with set_sched_policy()
SP_AUDIO_APP = 3,
SP_AUDIO_SYS = 4,
SP_TOP_APP = 5,
SP_CNT,
SP_MAX = SP_CNT - 1,
SP_SYSTEM_DEFAULT = SP_FOREGROUND,

10
libcutils/sched_policy.c
View file

@ -65,6 +65,7 @@ static int fg_cgroup_fd = -1;
static int system_bg_cpuset_fd = -1;
static int bg_cpuset_fd = -1;
static int fg_cpuset_fd = -1;
static int ta_cpuset_fd = -1; // special cpuset for top app
static int bg_schedboost_fd = -1;
static int fg_schedboost_fd = -1;
#endif
@ -133,6 +134,8 @@ static void __initialize(void) {
bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
filename = "/dev/cpuset/system-background/tasks";
system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
filename = "/dev/cpuset/top-app/tasks";
ta_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
#ifdef USE_SCHEDBOOST
filename = "/sys/fs/cgroup/stune/foreground/tasks";
@ -276,6 +279,10 @@ int set_cpuset_policy(int tid, SchedPolicy policy)
fd = fg_cpuset_fd;
boost_fd = fg_schedboost_fd;
break;
case SP_TOP_APP :
fd = ta_cpuset_fd;
boost_fd = fg_schedboost_fd;
break;
case SP_SYSTEM:
fd = system_bg_cpuset_fd;
boost_fd = bg_schedboost_fd;
@ -337,6 +344,7 @@ int set_sched_policy(int tid, SchedPolicy policy)
case SP_FOREGROUND:
case SP_AUDIO_APP:
case SP_AUDIO_SYS:
case SP_TOP_APP:
SLOGD("^^^ tid %d (%s)", tid, thread_name);
break;
case SP_SYSTEM:
@ -357,6 +365,7 @@ int set_sched_policy(int tid, SchedPolicy policy)
case SP_FOREGROUND:
case SP_AUDIO_APP:
case SP_AUDIO_SYS:
case SP_TOP_APP:
fd = fg_cgroup_fd;
break;
default:
@ -411,6 +420,7 @@ const char *get_sched_policy_name(SchedPolicy policy)
[SP_SYSTEM] = " ",
[SP_AUDIO_APP] = "aa",
[SP_AUDIO_SYS] = "as",
[SP_TOP_APP] = "ta",
};
if ((policy < SP_CNT) && (strings[policy] != NULL))
return strings[policy];

7
rootdir/init.rc
View file

@ -173,17 +173,23 @@ on init
write /dev/cpuset/system-background/cpus 0
write /dev/cpuset/system-background/mems 0
mkdir /dev/cpuset/top-app
write /dev/cpuset/top-app/cpus 0
write /dev/cpuset/top-app/mems 0
# change permissions for all cpusets we'll touch at runtime
chown system system /dev/cpuset
chown system system /dev/cpuset/foreground
chown system system /dev/cpuset/foreground/boost
chown system system /dev/cpuset/background
chown system system /dev/cpuset/system-background
chown system system /dev/cpuset/top-app
chown system system /dev/cpuset/tasks
chown system system /dev/cpuset/foreground/tasks
chown system system /dev/cpuset/foreground/boost/tasks
chown system system /dev/cpuset/background/tasks
chown system system /dev/cpuset/system-background/tasks
chown system system /dev/cpuset/top-app/tasks
# set system-background to 0775 so SurfaceFlinger can touch it
chmod 0775 /dev/cpuset/system-background
@ -192,6 +198,7 @@ on init
chmod 0664 /dev/cpuset/foreground/boost/tasks
chmod 0664 /dev/cpuset/background/tasks
chmod 0664 /dev/cpuset/system-background/tasks
chmod 0664 /dev/cpuset/top-app/tasks
chmod 0664 /dev/cpuset/tasks