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lmkd: Implement pid purge command to clear old pids when zygote restarts

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am: c89be17730

Change-Id: I11ebb0c22eedeaebd1c8f55ad5bec17abb82ba82
This commit is contained in:
Suren Baghdasaryan 2018-10-12 16:43:03 -07:00 • committed by android-build-merger
commit e6fcbe0719
2 changed files with 40 additions and 0 deletions
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10
lmkd/include/lmkd.h
View file

@ -30,6 +30,7 @@ enum lmk_cmd {
LMK_TARGET = 0, /* Associate minfree with oom_adj_score */
LMK_PROCPRIO, /* Register a process and set its oom_adj_score */
LMK_PROCREMOVE, /* Unregister a process */
LMK_PROCPURGE, /* Purge all registered processes */
};
/*
@ -142,6 +143,15 @@ inline size_t lmkd_pack_set_procremove(LMKD_CTRL_PACKET packet,
return 2 * sizeof(int);
}
/*
* Prepare LMK_PROCPURGE packet and return packet size in bytes.
* Warning: no checks performed, caller should ensure valid parameters.
*/
inline size_t lmkd_pack_set_procpurge(LMKD_CTRL_PACKET packet) {
packet[0] = htonl(LMK_PROCPURGE);
return sizeof(int);
}
__END_DECLS
#endif /* _LMKD_H_ */

30
lmkd/lmkd.c
View file

@ -619,6 +619,31 @@ static void cmd_procremove(LMKD_CTRL_PACKET packet) {
pid_remove(params.pid);
}
static void cmd_procpurge() {
int i;
struct proc *procp;
struct proc *next;
if (use_inkernel_interface) {
return;
}
for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
procadjslot_list[i].next = &procadjslot_list[i];
procadjslot_list[i].prev = &procadjslot_list[i];
}
for (i = 0; i < PIDHASH_SZ; i++) {
procp = pidhash[i];
while (procp) {
next = procp->pidhash_next;
free(procp);
procp = next;
}
}
memset(&pidhash[0], 0, sizeof(pidhash));
}
static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) {
int i;
struct lmk_target target;
@ -761,6 +786,11 @@ static void ctrl_command_handler(int dsock_idx) {
goto wronglen;
cmd_procremove(packet);
break;
case LMK_PROCPURGE:
if (nargs != 0)
goto wronglen;
cmd_procpurge();
break;
default:
ALOGE("Received unknown command code %d", cmd);
return;