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Commit 0ca93a33 authored by Patrick Daly's avatar Patrick Daly
Browse files

mm/oom-kill: Add option to panic when killing foreground app 



This setting is useful to debug memory intensive test scenarios,
which are close to the limit of what the device supports.

Change-Id: Id09f43736bd3c9586b4dac4fae570e78089f5bb3
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent aa7030af

include/linux/oom.h

+1 −0
Original line number Diff line number Diff line
@@ -135,5 +135,6 @@ extern int sysctl_reap_mem_on_sigkill; 


/* calls for LMK reaper */

extern void add_to_oom_reaper(struct task_struct *p);

extern void check_panic_on_foreground_kill(struct task_struct *p);

#define ULMK_MAGIC "lmkd"

#endif /* _INCLUDE_LINUX_OOM_H */

kernel/signal.c

+1 −0
Original line number Diff line number Diff line
@@ -1369,6 +1369,7 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p, 
	rcu_read_unlock();



	if (!ret && sig) {

		check_panic_on_foreground_kill(p);

		ret = do_send_sig_info(sig, info, p, type);

		if (capable(CAP_KILL) && sig == SIGKILL) {

			add_to_oom_reaper(p);

mm/oom_kill.c

+18 −0
Original line number Diff line number Diff line
@@ -58,6 +58,9 @@ int sysctl_oom_kill_allocating_task; 
int sysctl_oom_dump_tasks = 1;

int sysctl_reap_mem_on_sigkill = 1;



static int panic_on_adj_zero;

module_param(panic_on_adj_zero, int, 0644);



/*

 * Serializes oom killer invocations (out_of_memory()) from all contexts to

 * prevent from over eager oom killing (e.g. when the oom killer is invoked
@@ -1298,3 +1301,18 @@ void add_to_oom_reaper(struct task_struct *p) 


	put_task_struct(p);

}



/*

 * Should be called prior to sending sigkill. To guarantee that the

 * process to-be-killed is still untouched.

 */

void check_panic_on_foreground_kill(struct task_struct *p)

{

	if (unlikely(!strcmp(current->comm, ULMK_MAGIC)

			&& p->signal->oom_score_adj == 0

			&& panic_on_adj_zero)) {

		show_mem(SHOW_MEM_FILTER_NODES, NULL);

		show_mem_call_notifiers();

		panic("Attempt to kill foreground task: %s", p->comm);

	}

}