static void ShowStatus(void)
{
struct task_struct * task ;
show_free_areas_minimum () ;
for_each_process(task) {
LOGE("[Hang_Detect] %s found:%d.,RT[%lld]\n", task->comm, task->pid, sched_clock());
show_stack(task,NULL) ;
}
}
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;
int array_size = ARRAY_SIZE(lowmem_adj);
int other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
int other_file = global_page_state(NR_FILE_PAGES) -
global_page_state(NR_SHMEM);
/*
* If we already have a death outstanding, then
* bail out right away; indicating to vmscan
* that we have nothing further to offer on
* this pass.
*
*/
if (lowmem_deathpending &&
time_before_eq(jiffies, lowmem_deathpending_timeout))
return 0;
if (!spin_trylock(&lowmem_shrink_lock)){
lowmem_print(4, "lowmem_shrink lock faild\n");
return -1;
}
/* For JB: FOREGROUND is adj0 (Default lowmem_adj of AMS is 0, 1, 2, 4, 9, 15) */
/* For ICS: HOME is adj6 (Default lowmem_adj of AMS is 0, 1, 2, 4, 9, 15) */
if (other_free <= lowmem_minfree[1]) {
/* Notify Kernel that we should consider Android threshold */
lmk_adjz_minfree = lowmem_minfree[0];
} else {
lmk_adjz_minfree = 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 (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);
/*
* disable indication if low memory
*/
#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD)
if (in_lowmem) {
in_lowmem = 0;
lowmem_indicator = 1;
DAL_LowMemoryOff();
}
#endif
spin_unlock(&lowmem_shrink_lock);
return rem;
}
selected_oom_score_adj = min_score_adj;
// add debug log
#ifdef CONFIG_MT_ENG_BUILD
if (min_score_adj <= lowmem_debug_adj) {
lowmem_print(1, "======low memory killer=====\n");
lowmem_print(1, "Free memory other_free: %d, other_file:%d pages\n", other_free, other_file);
}
#endif
rcu_read_lock();
for_each_process(tsk) {
struct task_struct *p;
int oom_score_adj;
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)) {
lowmem_print(1, "lowmem_shrink return directly, due to %d (%s) is dying\n",
p->pid, p->comm);
task_unlock(p);
rcu_read_unlock();
spin_unlock(&lowmem_shrink_lock);
return 0;
}
/* We use oom_score_adj to represent oom_adj here although the later has been deprecated by kernel. */
/* This is because that JB AMS still uses oom_adj to stand for the importantance of activities. */
/* oom_score_adj = p->signal->oom_score_adj; - 2012.07.16 - */
oom_score_adj = p->signal->oom_adj;
#ifdef CONFIG_MT_ENG_BUILD
if (min_score_adj <= lowmem_debug_adj)
lowmem_print(1, "Candidate %d (%s), adj %d, rss %lu, to kill\n",
p->pid, p->comm, oom_score_adj, get_mm_rss(p->mm));
#endif
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(2, "select %d (%s), adj %d, size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
}
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 = selected;
lowmem_deathpending_timeout = jiffies + HZ;
#ifdef CONFIG_MT_ENG_BUILD
if (min_score_adj <= lowmem_debug_adj) {
lowmem_print(1, "low memory info:\n");
show_free_areas_minimum();
}
#endif
/*
* when kill adj=0 process trigger kernel warning, only in MTK internal eng/non_LCA load
*/
#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD) && \
!defined (MTK_LCA_SUPPORT) && !defined (PARTIAL_BUILD) //mtk internal
if (selected_oom_score_adj <= 0) { // can set 16 for test
lowmem_print(1, "low memory trigger kernel warning\n");
aee_kernel_warning_api("LMK", 0, DB_OPT_DEFAULT|DB_OPT_DUMPSYS_ACTIVITY,
"Framework low memory", "please contact AP/AF memory module owner\n");
}
#endif
/*
* show an indication if low memory
*/
#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD)
if (lowmem_indicator && selected_oom_score_adj <= 1) {
lowmem_print(5, "low memory: raise aee warning\n");
in_lowmem = 1;
lowmem_indicator = 0;
DAL_LowMemoryOn();
//aee_kernel_warning(module_name, lowmem_warning);
}
#endif
send_sig(SIGKILL, selected, 0);
set_tsk_thread_flag(selected, TIF_MEMDIE);
rem -= selected_tasksize;
}
lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
sc->nr_to_scan, sc->gfp_mask, rem);
rcu_read_unlock();
spin_unlock(&lowmem_shrink_lock);
return rem;
}
