static int android_oom_handler(struct notifier_block *nb,
unsigned long val, void *data)
{
struct task_struct *tsk;
#ifdef MULTIPLE_OOM_KILLER
struct task_struct *selected[OOM_DEPTH] = {NULL,};
#else
struct task_struct *selected = NULL;
#endif
int rem = 0;
int tasksize;
int i;
int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
#ifdef MULTIPLE_OOM_KILLER
int selected_tasksize[OOM_DEPTH] = {0,};
int selected_oom_score_adj[OOM_DEPTH] = {OOM_ADJUST_MAX,};
int all_selected_oom = 0;
int max_selected_oom_idx = 0;
#else
int selected_tasksize = 0;
int selected_oom_score_adj;
#endif
static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL/5, 1);
unsigned long *freed = data;
/* show status */
pr_warning("%s invoked Android-oom-killer: "
"oom_adj=%d, oom_score_adj=%d\n",
current->comm, current->signal->oom_adj,
current->signal->oom_score_adj);
dump_stack();
show_mem(SHOW_MEM_FILTER_NODES);
if (__ratelimit(&oom_rs))
dump_tasks_info();
min_score_adj = 0;
#ifdef MULTIPLE_OOM_KILLER
for (i = 0; i < OOM_DEPTH; i++)
selected_oom_score_adj[i] = min_score_adj;
#else
selected_oom_score_adj = min_score_adj;
#endif
#ifdef CONFIG_ZRAM_FOR_ANDROID
atomic_set(&s_reclaim.lmk_running, 1);
#endif
read_lock(&tasklist_lock);
for_each_process(tsk) {
struct task_struct *p;
int oom_score_adj;
#ifdef MULTIPLE_OOM_KILLER
int is_exist_oom_task = 0;
#endif
if (tsk->flags & PF_KTHREAD)
continue;
p = find_lock_task_mm(tsk);
if (!p)
continue;
oom_score_adj = p->signal->oom_score_adj;
if (oom_score_adj < min_score_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
task_unlock(p);
if (tasksize <= 0)
continue;
lowmem_print(2, "oom: ------ %d (%s), adj %d, size %d\n",
p->pid, p->comm, oom_score_adj, tasksize);
#ifdef MULTIPLE_OOM_KILLER
if (all_selected_oom < OOM_DEPTH) {
for (i = 0; i < OOM_DEPTH; i++) {
if (!selected[i]) {
is_exist_oom_task = 1;
max_selected_oom_idx = i;
break;
}
}
} else if (selected_oom_score_adj[max_selected_oom_idx] < oom_score_adj ||
(selected_oom_score_adj[max_selected_oom_idx] == oom_score_adj &&
selected_tasksize[max_selected_oom_idx] < tasksize)) {
is_exist_oom_task = 1;
}
if (is_exist_oom_task) {
selected[max_selected_oom_idx] = p;
selected_tasksize[max_selected_oom_idx] = tasksize;
selected_oom_score_adj[max_selected_oom_idx] = oom_score_adj;
if (all_selected_oom < OOM_DEPTH)
all_selected_oom++;
if (all_selected_oom == OOM_DEPTH) {
for (i = 0; i < OOM_DEPTH; i++) {
if (selected_oom_score_adj[i] < selected_oom_score_adj[max_selected_oom_idx])
max_selected_oom_idx = i;
else if (selected_oom_score_adj[i] == selected_oom_score_adj[max_selected_oom_idx] &&
selected_tasksize[i] < selected_tasksize[max_selected_oom_idx])
max_selected_oom_idx = i;
}
}
lowmem_print(2, "oom: max_selected_oom_idx(%d) select %d (%s), adj %d, \
size %d, to kill\n",
max_selected_oom_idx, p->pid, p->comm, oom_score_adj, tasksize);
}
#else
if (selected) {
if (oom_score_adj < selected_oom_score_adj)
continue;
if (oom_score_adj == selected_oom_score_adj &&
tasksize <= selected_tasksize)
continue;
}
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
lowmem_print(2, "oom: select %d (%s), adj %d, size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
#endif
}
#ifdef MULTIPLE_OOM_KILLER
for (i = 0; i < OOM_DEPTH; i++) {
if (selected[i]) {
lowmem_print(1, "oom: send sigkill to %d (%s), adj %d,\
size %d\n",
selected[i]->pid, selected[i]->comm,
selected_oom_score_adj[i],
selected_tasksize[i]);
send_sig(SIGKILL, selected[i], 0);
rem -= selected_tasksize[i];
*freed += (unsigned long)selected_tasksize[i];
#ifdef OOM_COUNT_READ
oom_count++;
#endif
}
}
#else
if (selected) {
lowmem_print(1, "oom: send sigkill to %d (%s), adj %d, size %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize);
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
*freed += (unsigned long)selected_tasksize;
#ifdef OOM_COUNT_READ
oom_count++;
#endif
}
#endif
read_unlock(&tasklist_lock);
#ifdef CONFIG_ZRAM_FOR_ANDROID
atomic_set(&s_reclaim.lmk_running, 0);
#endif
lowmem_print(2, "oom: get memory %lu", *freed);
return rem;
}
static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
struct task_struct *tsk;
#ifdef ENHANCED_LMK_ROUTINE
struct task_struct *selected[LOWMEM_DEATHPENDING_DEPTH] = {NULL,};
#else
struct task_struct *selected = NULL;
#endif
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO_VERBOSE
static DEFINE_RATELIMIT_STATE(lmk_rs, DEFAULT_RATELIMIT_INTERVAL, 0);
#else
static DEFINE_RATELIMIT_STATE(lmk_rs, 6*DEFAULT_RATELIMIT_INTERVAL, 0);
#endif
#endif
int rem = 0;
int tasksize;
int i;
int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
#ifdef ENHANCED_LMK_ROUTINE
int selected_tasksize[LOWMEM_DEATHPENDING_DEPTH] = {0,};
int selected_oom_score_adj[LOWMEM_DEATHPENDING_DEPTH] = {OOM_ADJUST_MAX,};
int all_selected_oom = 0;
int max_selected_oom_idx = 0;
#else
int selected_tasksize = 0;
int selected_oom_score_adj;
#endif
int array_size = ARRAY_SIZE(lowmem_adj);
#if (!defined(CONFIG_MACH_JF) \
&& !defined(CONFIG_SEC_PRODUCT_8960)\
)
unsigned long nr_to_scan = sc->nr_to_scan;
#endif
#ifndef CONFIG_CMA
int other_free = global_page_state(NR_FREE_PAGES);
#else
int other_free = global_page_state(NR_FREE_PAGES) -
global_page_state(NR_FREE_CMA_PAGES);
#endif
int other_file = global_page_state(NR_FILE_PAGES) - global_page_state(NR_SHMEM);
#ifdef CONFIG_ZRAM_FOR_ANDROID
other_file -= total_swapcache_pages;
#endif /* CONFIG_ZRAM_FOR_ANDROID */
if (lowmem_adj_size < array_size)
array_size = lowmem_adj_size;
if (lowmem_minfree_size < array_size)
array_size = lowmem_minfree_size;
for (i = 0; i < array_size; i++) {
if (other_free < lowmem_minfree[i] &&
other_file < lowmem_minfree[i]) {
min_score_adj = lowmem_adj[i];
break;
}
}
if (sc->nr_to_scan > 0)
lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
sc->nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
rem = global_page_state(NR_ACTIVE_ANON) +
global_page_state(NR_ACTIVE_FILE) +
global_page_state(NR_INACTIVE_ANON) +
global_page_state(NR_INACTIVE_FILE);
if (sc->nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
sc->nr_to_scan, sc->gfp_mask, rem);
return rem;
}
#ifdef ENHANCED_LMK_ROUTINE
for (i = 0; i < LOWMEM_DEATHPENDING_DEPTH; i++)
selected_oom_score_adj[i] = min_score_adj;
#else
selected_oom_score_adj = min_score_adj;
#endif
#ifdef CONFIG_ZRAM_FOR_ANDROID
atomic_set(&s_reclaim.lmk_running, 1);
#endif /* CONFIG_ZRAM_FOR_ANDROID */
read_lock(&tasklist_lock);
for_each_process(tsk) {
struct task_struct *p;
int oom_score_adj;
#ifdef ENHANCED_LMK_ROUTINE
int is_exist_oom_task = 0;
#endif
if (tsk->flags & PF_KTHREAD)
continue;
p = find_lock_task_mm(tsk);
if (!p)
continue;
if (test_tsk_thread_flag(p, TIF_MEMDIE) &&
time_before_eq(jiffies, lowmem_deathpending_timeout)) {
task_unlock(p);
read_unlock(&tasklist_lock);
#ifdef CONFIG_ZRAM_FOR_ANDROID
atomic_set(&s_reclaim.lmk_running, 0);
#endif /* CONFIG_ZRAM_FOR_ANDROID */
return 0;
}
oom_score_adj = p->signal->oom_score_adj;
if (oom_score_adj < min_score_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
task_unlock(p);
if (tasksize <= 0)
continue;
#ifdef ENHANCED_LMK_ROUTINE
if (all_selected_oom < LOWMEM_DEATHPENDING_DEPTH) {
for (i = 0; i < LOWMEM_DEATHPENDING_DEPTH; i++) {
if (!selected[i]) {
is_exist_oom_task = 1;
max_selected_oom_idx = i;
break;
}
}
} else if (selected_oom_score_adj[max_selected_oom_idx] < oom_score_adj ||
(selected_oom_score_adj[max_selected_oom_idx] == oom_score_adj &&
selected_tasksize[max_selected_oom_idx] < tasksize)) {
is_exist_oom_task = 1;
}
if (is_exist_oom_task) {
selected[max_selected_oom_idx] = p;
selected_tasksize[max_selected_oom_idx] = tasksize;
selected_oom_score_adj[max_selected_oom_idx] = oom_score_adj;
if (all_selected_oom < LOWMEM_DEATHPENDING_DEPTH)
all_selected_oom++;
if (all_selected_oom == LOWMEM_DEATHPENDING_DEPTH) {
for (i = 0; i < LOWMEM_DEATHPENDING_DEPTH; i++) {
if (selected_oom_score_adj[i] < selected_oom_score_adj[max_selected_oom_idx])
max_selected_oom_idx = i;
else if (selected_oom_score_adj[i] == selected_oom_score_adj[max_selected_oom_idx] &&
selected_tasksize[i] < selected_tasksize[max_selected_oom_idx])
max_selected_oom_idx = i;
}
}
lowmem_print(2, "select %d (%s), adj %d, \
size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
}
#else
if (selected) {
if (oom_score_adj < selected_oom_score_adj)
continue;
if (oom_score_adj == selected_oom_score_adj &&
tasksize <= selected_tasksize)
continue;
}
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
#endif
}
#ifdef ENHANCED_LMK_ROUTINE
for (i = 0; i < LOWMEM_DEATHPENDING_DEPTH; i++) {
if (selected[i]) {
lowmem_print(1, "send sigkill to %d (%s), adj %d,\
size %d, free memory = %d, reclaimable memory = %d\n",
selected[i]->pid, selected[i]->comm,
selected_oom_score_adj[i],
selected_tasksize[i],
other_free, other_file);
lowmem_deathpending_timeout = jiffies + HZ;
send_sig(SIGKILL, selected[i], 0);
set_tsk_thread_flag(selected[i], TIF_MEMDIE);
rem -= selected_tasksize[i];
#ifdef LMK_COUNT_READ
lmk_count++;
#endif
}
}
#else
if (selected) {
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize);
lowmem_deathpending_timeout = jiffies + HZ;
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
#ifdef LMK_COUNT_READ
lmk_count++;
#endif
}
#endif
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
if (__ratelimit(&lmk_rs)) {
lowmem_print(1, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO_VERBOSE
show_mem(SHOW_MEM_FILTER_NODES);
dump_tasks_info();
#endif
}
#endif
lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
sc->nr_to_scan, sc->gfp_mask, rem);
read_unlock(&tasklist_lock);
#ifdef CONFIG_ZRAM_FOR_ANDROID
atomic_set(&s_reclaim.lmk_running, 0);
#endif /* CONFIG_ZRAM_FOR_ANDROID */
return rem;
}
static int android_oom_handler(struct notifier_block *nb,
unsigned long val, void *data)
{
struct task_struct *tsk;
#ifdef MULTIPLE_OOM_KILLER
struct task_struct *selected[OOM_DEPTH] = {NULL,};
#else
struct task_struct *selected = NULL;
#endif
int rem = 0;
int tasksize;
int i;
int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
#ifdef MULTIPLE_OOM_KILLER
int selected_tasksize[OOM_DEPTH] = {0,};
int selected_oom_score_adj[OOM_DEPTH] = {OOM_ADJUST_MAX,};
int all_selected_oom = 0;
int max_selected_oom_idx = 0;
#else
int selected_tasksize = 0;
int selected_oom_score_adj;
#endif
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL/5, 1);
#endif
unsigned long *freed = data;
#if defined(CONFIG_CMA_PAGE_COUNTING)
unsigned long nr_cma_free;
unsigned long nr_cma_inactive_file;
unsigned long nr_cma_active_file;
int other_free;
int other_file;
nr_cma_free = global_page_state(NR_FREE_CMA_PAGES);
other_free = global_page_state(NR_FREE_PAGES) - nr_cma_free;
nr_cma_inactive_file = global_page_state(NR_CMA_INACTIVE_FILE);
nr_cma_active_file = global_page_state(NR_CMA_ACTIVE_FILE);
other_file = global_page_state(NR_FILE_PAGES) -
global_page_state(NR_SHMEM) -
total_swapcache_pages -
nr_cma_inactive_file -
nr_cma_active_file;
#endif
/* show status */
pr_warning("%s invoked Android-oom-killer: "
"oom_adj=%d, oom_score_adj=%d\n",
current->comm, current->signal->oom_adj,
current->signal->oom_score_adj);
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
if (__ratelimit(&oom_rs)) {
dump_stack();
show_mem(SHOW_MEM_FILTER_NODES);
dump_tasks_info();
}
#endif
min_score_adj = 0;
#ifdef MULTIPLE_OOM_KILLER
for (i = 0; i < OOM_DEPTH; i++)
selected_oom_score_adj[i] = min_score_adj;
#else
selected_oom_score_adj = min_score_adj;
#endif
read_lock(&tasklist_lock);
for_each_process(tsk) {
struct task_struct *p;
int oom_score_adj;
#ifdef MULTIPLE_OOM_KILLER
int is_exist_oom_task = 0;
#endif
if (tsk->flags & PF_KTHREAD)
continue;
p = find_lock_task_mm(tsk);
if (!p)
continue;
oom_score_adj = p->signal->oom_score_adj;
if (oom_score_adj < min_score_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
task_unlock(p);
if (tasksize <= 0)
continue;
lowmem_print(2, "oom: ------ %d (%s), adj %d, size %d\n",
p->pid, p->comm, oom_score_adj, tasksize);
#ifdef MULTIPLE_OOM_KILLER
if (all_selected_oom < OOM_DEPTH) {
for (i = 0; i < OOM_DEPTH; i++) {
if (!selected[i]) {
is_exist_oom_task = 1;
max_selected_oom_idx = i;
break;
}
}
} else if (selected_oom_score_adj[max_selected_oom_idx] < oom_score_adj ||
(selected_oom_score_adj[max_selected_oom_idx] == oom_score_adj &&
selected_tasksize[max_selected_oom_idx] < tasksize)) {
is_exist_oom_task = 1;
}
if (is_exist_oom_task) {
selected[max_selected_oom_idx] = p;
selected_tasksize[max_selected_oom_idx] = tasksize;
selected_oom_score_adj[max_selected_oom_idx] = oom_score_adj;
if (all_selected_oom < OOM_DEPTH)
all_selected_oom++;
if (all_selected_oom == OOM_DEPTH) {
for (i = 0; i < OOM_DEPTH; i++) {
if (selected_oom_score_adj[i] < selected_oom_score_adj[max_selected_oom_idx])
max_selected_oom_idx = i;
else if (selected_oom_score_adj[i] == selected_oom_score_adj[max_selected_oom_idx] &&
selected_tasksize[i] < selected_tasksize[max_selected_oom_idx])
max_selected_oom_idx = i;
}
}
lowmem_print(2, "oom: max_selected_oom_idx(%d) select %d (%s), adj %d, \
size %d, to kill\n",
max_selected_oom_idx, p->pid, p->comm, oom_score_adj, tasksize);
}
#else
if (selected) {
if (oom_score_adj < selected_oom_score_adj)
continue;
if (oom_score_adj == selected_oom_score_adj &&
tasksize <= selected_tasksize)
continue;
}
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
lowmem_print(2, "oom: select %d (%s), adj %d, size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
#endif
}
#ifdef MULTIPLE_OOM_KILLER
for (i = 0; i < OOM_DEPTH; i++) {
if (selected[i]) {
#if defined(CONFIG_CMA_PAGE_COUNTING)
lowmem_print(1, "oom: send sigkill to %d (%s), adj %d, "
"size %d ofree %d ofile %d "
"cma_free %lu cma_i_file %lu cma_a_file %lu\n",
selected[i]->pid, selected[i]->comm,
selected_oom_score_adj[i],
selected_tasksize[i],
other_free, other_file,
nr_cma_free, nr_cma_inactive_file, nr_cma_active_file);
#else
lowmem_print(1, "oom: send sigkill to %d (%s), adj %d,\
size %d\n",
selected[i]->pid, selected[i]->comm,
selected_oom_score_adj[i],
selected_tasksize[i]);
#endif
send_sig(SIGKILL, selected[i], 0);
rem -= selected_tasksize[i];
*freed += (unsigned long)selected_tasksize[i];
#ifdef OOM_COUNT_READ
oom_count++;
#endif
}
}
#else
if (selected) {
lowmem_print(1, "oom: send sigkill to %d (%s), adj %d, size %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize);
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
*freed += (unsigned long)selected_tasksize;
#ifdef OOM_COUNT_READ
oom_count++;
#endif
}
#endif
read_unlock(&tasklist_lock);
lowmem_print(2, "oom: get memory %lu", *freed);
return rem;
}
static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
struct task_struct *tsk;
struct task_struct *selected = NULL;
int rem = 0;
int tasksize;
int i;
int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
int selected_tasksize = 0;
int selected_oom_score_adj;
#ifdef CONFIG_SAMP_HOTNESS
int selected_hotness_adj = 0;
#endif
int array_size = ARRAY_SIZE(lowmem_adj);
int other_free;
int other_file;
unsigned long nr_to_scan = sc->nr_to_scan;
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
static DEFINE_RATELIMIT_STATE(lmk_rs, DEFAULT_RATELIMIT_INTERVAL, 1);
#endif
unsigned long nr_cma_free;
struct reclaim_state *reclaim_state = current->reclaim_state;
#if defined(CONFIG_CMA_PAGE_COUNTING)
unsigned long nr_cma_inactive_file;
unsigned long nr_cma_active_file;
unsigned long cma_page_ratio;
bool is_active_high;
bool flag = 0;
#endif
if (nr_to_scan > 0) {
if (mutex_lock_interruptible(&scan_mutex) < 0)
return 0;
}
other_free = global_page_state(NR_FREE_PAGES);
nr_cma_free = global_page_state(NR_FREE_CMA_PAGES);
#ifdef CONFIG_ZSWAP
if (!current_is_kswapd() || sc->priority <= 6)
#endif
other_free -= nr_cma_free;
#if defined(CONFIG_CMA_PAGE_COUNTING)
nr_cma_inactive_file = global_page_state(NR_CMA_INACTIVE_FILE);
nr_cma_active_file = global_page_state(NR_CMA_ACTIVE_FILE);
cma_page_ratio = 100 * global_page_state(NR_CMA_INACTIVE_FILE) /
global_page_state(NR_INACTIVE_FILE);
is_active_high = (global_page_state(NR_ACTIVE_FILE) >
global_page_state(NR_INACTIVE_FILE)) ? 1 : 0;
#endif
other_file = global_page_state(NR_FILE_PAGES);
#if defined(CONFIG_CMA_PAGE_COUNTING) && defined(CONFIG_EXCLUDE_LRU_LIVING_IN_CMA)
if (get_nr_swap_pages() < SSWAP_LMK_THRESHOLD && cma_page_ratio >= CMA_PAGE_RATIO
&& !is_active_high) {
other_file = other_file - (nr_cma_inactive_file + nr_cma_active_file);
flag = 1;
}
#endif
if (global_page_state(NR_SHMEM) + total_swapcache_pages < other_file)
other_file -= global_page_state(NR_SHMEM) + total_swapcache_pages;
else
other_file = 0;
if (lowmem_adj_size < array_size)
array_size = lowmem_adj_size;
if (lowmem_minfree_size < array_size)
array_size = lowmem_minfree_size;
for (i = 0; i < array_size; i++) {
if (other_free < lowmem_minfree[i] &&
other_file < lowmem_minfree[i]) {
min_score_adj = lowmem_adj[i];
break;
}
}
if (nr_to_scan > 0)
lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
rem = global_page_state(NR_ACTIVE_ANON) +
global_page_state(NR_ACTIVE_FILE) +
global_page_state(NR_INACTIVE_ANON) +
global_page_state(NR_INACTIVE_FILE);
if (nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
nr_to_scan, sc->gfp_mask, rem);
if (nr_to_scan > 0)
mutex_unlock(&scan_mutex);
return rem;
}
selected_oom_score_adj = min_score_adj;
rcu_read_lock();
for_each_process(tsk) {
struct task_struct *p;
int oom_score_adj;
#ifdef CONFIG_SAMP_HOTNESS
int hotness_adj = 0;
#endif
if (tsk->flags & PF_KTHREAD)
continue;
/* if task no longer has any memory ignore it */
if (test_task_flag(tsk, TIF_MM_RELEASED))
continue;
if (time_before_eq(jiffies, lowmem_deathpending_timeout)) {
if (test_task_flag(tsk, TIF_MEMDIE)) {
rcu_read_unlock();
/* give the system time to free up the memory */
msleep_interruptible(20);
mutex_unlock(&scan_mutex);
return 0;
}
}
p = find_lock_task_mm(tsk);
if (!p)
continue;
oom_score_adj = p->signal->oom_score_adj;
if (oom_score_adj < min_score_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
#if defined(CONFIG_ZSWAP)
if (atomic_read(&zswap_stored_pages)) {
lowmem_print(3, "shown tasksize : %d\n", tasksize);
tasksize += atomic_read(&zswap_pool_pages) * get_mm_counter(p->mm, MM_SWAPENTS)
/ atomic_read(&zswap_stored_pages);
lowmem_print(3, "real tasksize : %d\n", tasksize);
}
#endif
#ifdef CONFIG_SAMP_HOTNESS
hotness_adj = p->signal->hotness_adj;
#endif
task_unlock(p);
if (tasksize <= 0)
continue;
if (selected) {
#ifdef CONFIG_SAMP_HOTNESS
if (min_score_adj <= lowmem_adj[4]) {
#endif
if (oom_score_adj < selected_oom_score_adj)
continue;
if (oom_score_adj == selected_oom_score_adj &&
tasksize <= selected_tasksize)
continue;
#ifdef CONFIG_SAMP_HOTNESS
} else {
if (hotness_adj > selected_hotness_adj)
continue;
if (hotness_adj == selected_hotness_adj && tasksize <= selected_tasksize)
continue;
}
#endif
}
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
#ifdef CONFIG_SAMP_HOTNESS
selected_hotness_adj = hotness_adj;
#endif
lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
}
if (selected) {
#if defined(CONFIG_CMA_PAGE_COUNTING)
#ifdef CONFIG_SAMP_HOTNESS
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d, "
"ofree %d, ofile %d(%c), is_kswapd %d - "
"cma_free %lu priority %d cma_i_file %lu cma_a_file %lu, hotness %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize,
other_free, other_file, flag ? '-' : '+',
!!current_is_kswapd(),
nr_cma_free, sc->priority,
nr_cma_inactive_file, nr_cma_active_file, selected_hotness_adj);
#else
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d, "
"ofree %d, ofile %d(%c), is_kswapd %d - "
"cma_free %lu priority %d cma_i_file %lu cma_a_file %lu\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize,
other_free, other_file, flag ? '-' : '+',
!!current_is_kswapd(),
nr_cma_free, sc->priority,
nr_cma_inactive_file, nr_cma_active_file);
#endif
#else
#ifdef CONFIG_SAMP_HOTNESS
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d, "
"free memory = %d, reclaimable memory = %d "
"is_kswapd %d cma_free %lu priority %d, hotness %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize,
other_free, other_file,
!!current_is_kswapd(),
nr_cma_free, sc->priority, selected_hotness_adj);
#else
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d, "
"free memory = %d, reclaimable memory = %d "
"is_kswapd %d cma_free %lu priority %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize,
other_free, other_file,
!!current_is_kswapd(),
nr_cma_free, sc->priority);
#endif
#endif
lowmem_deathpending_timeout = jiffies + HZ;
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
rcu_read_unlock();
#ifdef LMK_COUNT_READ
lmk_count++;
#endif
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
if ((selected_oom_score_adj < lowmem_adj[5]) && __ratelimit(&lmk_rs)) {
lowmem_print(1, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
show_mem(SHOW_MEM_FILTER_NODES);
dump_tasks_info();
}
#endif
/* give the system time to free up the memory */
msleep_interruptible(20);
if(reclaim_state)
reclaim_state->reclaimed_slab = selected_tasksize;
} else
rcu_read_unlock();
lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
nr_to_scan, sc->gfp_mask, rem);
mutex_unlock(&scan_mutex);
return rem;
}
static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
struct task_struct *tsk;
struct task_struct *selected = NULL;
int rem = 0;
int tasksize;
int i;
short min_score_adj = OOM_SCORE_ADJ_MAX + 1;
int minfree = 0;
int selected_tasksize = 0;
short selected_oom_score_adj;
int array_size = ARRAY_SIZE(lowmem_adj);
int other_free;
int other_file;
unsigned long nr_to_scan = sc->nr_to_scan;
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
static DEFINE_RATELIMIT_STATE(lmk_rs, DEFAULT_RATELIMIT_INTERVAL, 1);
#endif
unsigned long nr_cma_free;
if (nr_to_scan > 0) {
if (mutex_lock_interruptible(&scan_mutex) < 0)
return 0;
}
other_free = global_page_state(NR_FREE_PAGES);
nr_cma_free = global_page_state(NR_FREE_CMA_PAGES);
if (!current_is_kswapd() || sc->priority <= 6)
other_free -= nr_cma_free;
if (global_page_state(NR_SHMEM) + total_swapcache_pages() <
global_page_state(NR_FILE_PAGES))
other_file = global_page_state(NR_FILE_PAGES) -
global_page_state(NR_SHMEM) -
total_swapcache_pages();
else
other_file = 0;
if (lowmem_adj_size < array_size)
array_size = lowmem_adj_size;
if (lowmem_minfree_size < array_size)
array_size = lowmem_minfree_size;
for (i = 0; i < array_size; i++) {
minfree = lowmem_minfree[i];
if (other_free < minfree && other_file < minfree) {
min_score_adj = lowmem_adj[i];
break;
}
}
if (nr_to_scan > 0)
lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n",
nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
rem = global_page_state(NR_ACTIVE_ANON) +
global_page_state(NR_ACTIVE_FILE) +
global_page_state(NR_INACTIVE_ANON) +
global_page_state(NR_INACTIVE_FILE);
if (nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
nr_to_scan, sc->gfp_mask, rem);
if (nr_to_scan > 0)
mutex_unlock(&scan_mutex);
return rem;
}
selected_oom_score_adj = min_score_adj;
rcu_read_lock();
for_each_process(tsk) {
struct task_struct *p;
short oom_score_adj;
if (tsk->flags & PF_KTHREAD ||
tsk->state & TASK_UNINTERRUPTIBLE)
continue;
/* if task no longer has any memory ignore it */
if (test_task_flag(tsk, TIF_MM_RELEASED))
continue;
if (time_before_eq(jiffies, lowmem_deathpending_timeout)) {
if (test_task_flag(tsk, TIF_MEMDIE)) {
rcu_read_unlock();
/* give the system time to free up the memory */
msleep_interruptible(20);
mutex_unlock(&scan_mutex);
return 0;
}
}
p = find_lock_task_mm(tsk);
if (!p)
continue;
oom_score_adj = p->signal->oom_score_adj;
if (oom_score_adj < min_score_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
task_unlock(p);
if (tasksize <= 0)
continue;
if (selected) {
if (oom_score_adj < selected_oom_score_adj)
continue;
if (oom_score_adj == selected_oom_score_adj &&
tasksize <= selected_tasksize)
continue;
}
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
lowmem_print(3, "select '%s' (%d), adj %hd, size %d, to kill\n",
p->comm, p->pid, oom_score_adj, tasksize);
}
if (selected) {
lowmem_print(1, "Killing '%s' (%d), adj %hd,\n" \
" to free %ldkB on behalf of '%s' (%d) because\n" \
" cache %ldkB is below limit %ldkB for oom_score_adj %hd\n" \
" Free memory is %ldkB above reserved.\n" \
" is_kswapd %d priority %d\n" \
" Free CMA is %ldkB\n" \
" Total reserve is %ldkB\n" \
" Total free pages is %ldkB\n" \
" Total file cache is %ldkB\n" \
" Slab Reclaimable is %ldkB\n" \
" Slab UnReclaimable is %ldkB\n" \
" Total Slab is %ldkB\n" \
" GFP mask is 0x%x\n",
selected->comm, selected->pid,
selected_oom_score_adj,
selected_tasksize * (long)(PAGE_SIZE / 1024),
current->comm, current->pid,
other_file * (long)(PAGE_SIZE / 1024),
minfree * (long)(PAGE_SIZE / 1024),
min_score_adj,
other_free * (long)(PAGE_SIZE / 1024),
!!current_is_kswapd(),
sc->priority,
nr_cma_free *
(long)(PAGE_SIZE / 1024),
totalreserve_pages * (long)(PAGE_SIZE / 1024),
global_page_state(NR_FREE_PAGES) *
(long)(PAGE_SIZE / 1024),
global_page_state(NR_FILE_PAGES) *
(long)(PAGE_SIZE / 1024),
global_page_state(NR_SLAB_RECLAIMABLE) *
(long)(PAGE_SIZE / 1024),
global_page_state(NR_SLAB_UNRECLAIMABLE) *
(long)(PAGE_SIZE / 1024),
global_page_state(NR_SLAB_RECLAIMABLE) *
(long)(PAGE_SIZE / 1024) +
global_page_state(NR_SLAB_UNRECLAIMABLE) *
(long)(PAGE_SIZE / 1024),
sc->gfp_mask);
if (lowmem_debug_level >= 2 && selected_oom_score_adj == 0) {
show_mem(SHOW_MEM_FILTER_NODES);
dump_tasks(NULL, NULL);
show_mem_call_notifiers();
}
lowmem_deathpending_timeout = jiffies + HZ;
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
rcu_read_unlock();
#ifdef LMK_COUNT_READ
lmk_count++;
#endif
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
if (__ratelimit(&lmk_rs)) {
lowmem_print(1, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
show_mem(SHOW_MEM_FILTER_NODES);
dump_tasks_info();
}
#endif
/* give the system time to free up the memory */
msleep_interruptible(20);
} else
rcu_read_unlock();
lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
nr_to_scan, sc->gfp_mask, rem);
mutex_unlock(&scan_mutex);
return rem;
}
static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
struct task_struct *tsk;
struct task_struct *selected = NULL;
int rem = 0;
int tasksize;
int i;
int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
int minfree = 0;
int selected_tasksize = 0;
int selected_oom_score_adj;
int array_size = ARRAY_SIZE(lowmem_adj);
int other_free;
int other_file;
struct reclaim_state *reclaim_state;
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
static DEFINE_RATELIMIT_STATE(lmk_rs, DEFAULT_RATELIMIT_INTERVAL, 1);
#endif
if (sc->nr_to_scan > 0) {
if (mutex_lock_interruptible(&scan_mutex) < 0)
return 0;
}
other_free = global_page_state(NR_FREE_PAGES);
other_file = global_page_state(NR_FILE_PAGES) -
global_page_state(NR_SHMEM);
reclaim_state = current->reclaim_state;
#if defined(CONFIG_ZSWAP)
other_file -= total_swapcache_pages;
#endif
if (lowmem_adj_size < array_size)
array_size = lowmem_adj_size;
if (lowmem_minfree_size < array_size)
array_size = lowmem_minfree_size;
for (i = 0; i < array_size; i++) {
minfree = lowmem_minfree[i];
if (other_free < minfree && other_file < minfree) {
min_score_adj = lowmem_adj[i];
break;
}
}
if (sc->nr_to_scan > 0)
lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
sc->nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
rem = global_page_state(NR_ACTIVE_ANON) +
global_page_state(NR_ACTIVE_FILE) +
global_page_state(NR_INACTIVE_ANON) +
global_page_state(NR_INACTIVE_FILE);
if (sc->nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
sc->nr_to_scan, sc->gfp_mask, rem);
if (sc->nr_to_scan > 0)
mutex_unlock(&scan_mutex);
return rem;
}
selected_oom_score_adj = min_score_adj;
rcu_read_lock();
for_each_process(tsk) {
struct task_struct *p;
int oom_score_adj;
if (tsk->flags & PF_KTHREAD)
continue;
/* if task no longer has any memory ignore it */
if (test_task_flag(tsk, TIF_MM_RELEASED))
continue;
if (time_before_eq(jiffies, lowmem_deathpending_timeout)) {
if (test_task_flag(tsk, TIF_MEMDIE)) {
rcu_read_unlock();
/* give the system time to free up the memory */
msleep_interruptible(20);
mutex_unlock(&scan_mutex);
return 0;
}
}
p = find_lock_task_mm(tsk);
if (!p)
continue;
oom_score_adj = p->signal->oom_score_adj;
if (oom_score_adj < min_score_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
#if defined(CONFIG_ZSWAP)
if (atomic_read(&zswap_stored_pages)) {
lowmem_print(3, "shown tasksize : %d\n", tasksize);
tasksize += atomic_read(&zswap_pool_pages) * get_mm_counter(p->mm, MM_SWAPENTS)
/ atomic_read(&zswap_stored_pages);
lowmem_print(3, "real tasksize : %d\n", tasksize);
}
#endif
task_unlock(p);
if (tasksize <= 0)
continue;
if (selected) {
if (oom_score_adj < selected_oom_score_adj)
continue;
if (oom_score_adj == selected_oom_score_adj &&
tasksize <= selected_tasksize)
continue;
}
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
lowmem_print(2, "select '%s' (%d), adj %d, size %d, to kill\n",
p->comm, p->pid, oom_score_adj, tasksize);
}
if (selected) {
lowmem_print(1, "Killing '%s' (%d), adj %d,\n" \
" to free %ldkB on behalf of '%s' (%d) because\n" \
" cache %ldkB is below limit %ldkB for oom_score_adj %d\n" \
" Free memory is %ldkB above reserved\n",
selected->comm, selected->pid,
selected_oom_score_adj,
selected_tasksize * (long)(PAGE_SIZE / 1024),
current->comm, current->pid,
other_file * (long)(PAGE_SIZE / 1024),
minfree * (long)(PAGE_SIZE / 1024),
min_score_adj,
other_free * (long)(PAGE_SIZE / 1024));
lowmem_deathpending_timeout = jiffies + HZ;
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
rcu_read_unlock();
#ifdef LMK_COUNT_READ
lmk_count++;
#endif
#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
if (__ratelimit(&lmk_rs)) {
dump_tasks_info();
}
#endif
/* give the system time to free up the memory */
msleep_interruptible(20);
if(reclaim_state)
reclaim_state->reclaimed_slab += selected_tasksize;
} else
rcu_read_unlock();
lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
sc->nr_to_scan, sc->gfp_mask, rem);
mutex_unlock(&scan_mutex);
return rem;
}