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Improve cpuset support for surfaceflinger.

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SurfaceFlinger needs some of its threads in the system-background cpuset
and some of its threads (the binder pool) outside of the
system-background cpuset in order to improve UI perf/power
consumption. Remove surfaceflinger from the system-background cpuset in
init.rc and allow a thread to place itself in the system-background
cpuset given enough permissions.

bug 25745866

Change-Id: I85f7e41c5439e6ad7cc2d355e51f5dfb3a0c7088
This commit is contained in:
Tim Murray 2015-11-10 14:31:09 -08:00 committed by Justin Harrison
parent 1589fa1bda
commit 6eee56ccab
2 changed files with 15 additions and 1 deletions
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9
libcutils/sched_policy.c
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@ -61,6 +61,7 @@ static int bg_cgroup_fd = -1;
static int fg_cgroup_fd = -1;
// File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error
static int system_bg_cpuset_fd = -1;
static int bg_cpuset_fd = -1;
static int fg_cpuset_fd = -1;
@ -126,6 +127,11 @@ static void __initialize(void) {
fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
filename = "/dev/cpuset/background/tasks";
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);
if (system_bg_cpuset_fd < 0) {
SLOGE("initialize of system-bg failed: %s\n", strerror(errno));
}
}
#endif
@ -260,6 +266,9 @@ int set_cpuset_policy(int tid, SchedPolicy policy)
case SP_AUDIO_SYS:
fd = fg_cpuset_fd;
break;
case SP_SYSTEM:
fd = system_bg_cpuset_fd;
break;
default:
fd = -1;
break;

7
rootdir/init.rc
View file

@ -165,13 +165,19 @@ on init
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/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
# set system-background to 0775 so SurfaceFlinger can touch it
chmod 0775 /dev/cpuset/system-background
chmod 0664 /dev/cpuset/foreground/tasks
chmod 0664 /dev/cpuset/foreground/boost/tasks
chmod 0664 /dev/cpuset/background/tasks
chmod 0664 /dev/cpuset/system-background/tasks
chmod 0664 /dev/cpuset/tasks
@ -646,7 +652,6 @@ service surfaceflinger /system/bin/surfaceflinger
user system
group graphics drmrpc
onrestart restart zygote
writepid /dev/cpuset/system-background/tasks
service drm /system/bin/drmserver
class main