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Commit d1b6cf4f authored by Patrick Daly's avatar Patrick Daly
Browse files

mm/oom-kill: Add debug policy 



Add hooks for triggering ramdump collection when an unexpected
state is encountered.

Change-Id: Ifeaa83f9ac8f6437c0b48edf9aff11e4c16961bc
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent 6d9db847

mm/oom_kill.c

+11 −0
Original line number Diff line number Diff line
@@ -81,6 +81,13 @@ DEFINE_MUTEX(oom_lock); 
/* The maximum amount of time to loop in should_ulmk_retry() */

#define ULMK_TIMEOUT (20 * HZ)



#define ULMK_DBG_POLICY_TRIGGER (BIT(0))

#define ULMK_DBG_POLICY_WDOG (BIT(1))

#define ULMK_DBG_POLICY_POSITIVE_ADJ (BIT(2))

#define ULMK_DBG_POLICY_ALL (BIT(3) - 1)

static unsigned int ulmk_dbg_policy;

module_param(ulmk_dbg_policy, uint, 0644);



static atomic64_t ulmk_wdog_expired = ATOMIC64_INIT(0);

static atomic64_t ulmk_kill_jiffies = ATOMIC64_INIT(INITIAL_JIFFIES);

static unsigned long psi_emergency_jiffies = INITIAL_JIFFIES;
@@ -157,13 +164,16 @@ bool should_ulmk_retry(gfp_t gfp_mask) 
	} else if (time_after(now, psi_emergency_jiffies + ULMK_TIMEOUT)) {

		ret = false;

	} else if (!trigger_active) {

		BUG_ON(ulmk_dbg_policy & ULMK_DBG_POLICY_TRIGGER);

		psi_emergency_trigger();

		ret = true;

	} else if (wdog_expired) {

		mutex_lock(&oom_lock);

		ret = out_of_memory(&oc);

		mutex_unlock(&oom_lock);

		BUG_ON(!ret && ulmk_dbg_policy & ULMK_DBG_POLICY_POSITIVE_ADJ);

	} else if (!ulmk_kill_possible()) {

		BUG_ON(ulmk_dbg_policy & ULMK_DBG_POLICY_POSITIVE_ADJ);

		ret = false;

	}
@@ -174,6 +184,7 @@ bool should_ulmk_retry(gfp_t gfp_mask) 
void ulmk_watchdog_fn(struct timer_list *t)

{

	atomic64_set(&ulmk_wdog_expired, 1);

	BUG_ON(ulmk_dbg_policy & ULMK_DBG_POLICY_WDOG);

}



void ulmk_watchdog_pet(struct timer_list *t)