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Commit 164baebc authored by Robert Benea's avatar Robert Benea
Browse files

Allow ANDROID_LOW_MEMORY_KILLER to coexist with lmkd 

For Go devices fallback to memcg/memory pressure events for LMK.
Go devices will use memcg pressure events while inkernel module
is disabled.

Bug: 64852905
Test: tested on gobo
Change-Id: I267ab00be85e324331f6c91551ba013184de817e
parent f6397586

lmkd/lmkd.c

+8 −4
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ enum lmk_cmd { 


/* default to old in-kernel interface if no memory pressure events */

static int use_inkernel_interface = 1;

static bool has_inkernel_module;



/* memory pressure level medium event */

static int mpevfd[2];
@@ -81,6 +82,7 @@ static int critical_oomadj; 
static bool debug_process_killing;

static bool enable_pressure_upgrade;

static int64_t upgrade_pressure;

static bool is_go_device;



/* control socket listen and data */

static int ctrl_lfd;
@@ -332,7 +334,7 @@ static void cmd_target(int ntargets, int *params) { 


    lowmem_targets_size = ntargets;



    if (use_inkernel_interface) {

    if (has_inkernel_module) {

        char minfreestr[128];

        char killpriostr[128];
@@ -347,9 +349,9 @@ static void cmd_target(int ntargets, int *params) { 
                strlcat(killpriostr, ",", sizeof(killpriostr));

            }



            snprintf(val, sizeof(val), "%d", lowmem_minfree[i]);

            snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0);

            strlcat(minfreestr, val, sizeof(minfreestr));

            snprintf(val, sizeof(val), "%d", lowmem_adj[i]);

            snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0);

            strlcat(killpriostr, val, sizeof(killpriostr));

        }
@@ -821,7 +823,8 @@ static int init(void) { 
    }

    maxevents++;



    use_inkernel_interface = !access(INKERNEL_MINFREE_PATH, W_OK);

    has_inkernel_module = !access(INKERNEL_MINFREE_PATH, W_OK);

    use_inkernel_interface = has_inkernel_module && !is_go_device;



    if (use_inkernel_interface) {

        ALOGI("Using in-kernel low memory killer interface");
@@ -875,6 +878,7 @@ int main(int argc __unused, char **argv __unused) { 
    debug_process_killing = property_get_bool("ro.lmk.debug", false);

    enable_pressure_upgrade = property_get_bool("ro.lmk.critical_upgrade", false);

    upgrade_pressure = (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 50);

    is_go_device = property_get_bool("ro.config.low_ram", false);



    mlockall(MCL_FUTURE);

    sched_setscheduler(0, SCHED_FIFO, &param);