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lmkd: add logic to kill the heaviest of the eligible processes 

Killing the most memory-demanding process from the set of eligible
processes yields better results on high-performance devices than
killing the first one we could find. This is in line with how in-kernel
lowmemorykiller driver chooses its victims.

Bug: 63631020
Test: alloc-stress

Change-Id: Ie1ef7f33f3e79698a9b4120c14490386d6129f9b
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan 2017-12-08 13:17:06 -08:00
parent ad2fd9150b
commit 662492ab1d
1 changed files with 30 additions and 1 deletions
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31
lmkd/lmkd.c
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@ -91,6 +91,7 @@ static bool enable_pressure_upgrade;
static int64_t upgrade_pressure;
static int64_t downgrade_pressure;
static bool is_go_device;
static bool kill_heaviest_task;
/* control socket listen and data */
static int ctrl_lfd;
@ -593,6 +594,29 @@ static struct proc *proc_adj_lru(int oomadj) {
return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]);
}
static struct proc *proc_get_heaviest(int oomadj) {
struct adjslot_list *head = &procadjslot_list[ADJTOSLOT(oomadj)];
struct adjslot_list *curr = head->next;
struct proc *maxprocp = NULL;
int maxsize = 0;
while (curr != head) {
int pid = ((struct proc *)curr)->pid;
int tasksize = proc_get_size(pid);
if (tasksize <= 0) {
struct adjslot_list *next = curr->next;
pid_remove(pid);
curr = next;
} else {
if (tasksize > maxsize) {
maxsize = tasksize;
maxprocp = (struct proc *)curr;
}
curr = curr->next;
}
}
return maxprocp;
}
/* Kill one process specified by procp. Returns the size of the process killed */
static int kill_one_process(struct proc* procp, int min_score_adj,
enum vmpressure_level level) {
@ -643,7 +667,10 @@ static int find_and_kill_process(enum vmpressure_level level) {
struct proc *procp;
retry:
procp = proc_adj_lru(i);
if (kill_heaviest_task)
procp = proc_get_heaviest(i);
else
procp = proc_adj_lru(i);
if (procp) {
killed_size = kill_one_process(procp, min_score_adj, level);
@ -929,6 +956,8 @@ int main(int argc __unused, char **argv __unused) {
(int64_t)property_get_int32("ro.lmk.upgrade_pressure", 100);
downgrade_pressure =
(int64_t)property_get_int32("ro.lmk.downgrade_pressure", 100);
kill_heaviest_task =
property_get_bool("ro.lmk.kill_heaviest_task", true);
is_go_device = property_get_bool("ro.config.low_ram", false);
if (mlockall(MCL_CURRENT | MCL_FUTURE))