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Commit 2eada807 authored by Channagoud Kadabi's avatar Channagoud Kadabi
Browse files

kernel: rcu: Panic on RCU stall 



Enable panic on RCU stalls if the RCU_PANIC_ON_STALL is enabled. This
helps collecting the cpu context for debugging.

Change-Id: Ibc95799df995bf31053152ab9b3894710fcd9f43
Signed-off-by: default avatarChannagoud Kadabi <ckadabi@codeaurora.org>
parent 58eb1df2

kernel/rcu/tree.c

+1 −1
Original line number Diff line number Diff line
@@ -124,7 +124,7 @@ int rcu_num_lvls __read_mostly = RCU_NUM_LVLS; 
static int num_rcu_lvl[] = NUM_RCU_LVL_INIT;

int rcu_num_nodes __read_mostly = NUM_RCU_NODES; /* Total # rcu_nodes in use. */

/* panic() on RCU Stall sysctl. */

int sysctl_panic_on_rcu_stall __read_mostly;

int sysctl_panic_on_rcu_stall __read_mostly = CONFIG_RCU_PANIC_ON_STALL;



/*

 * The rcu_scheduler_active variable is initialized to the value

lib/Kconfig.debug

+12 −0
Original line number Diff line number Diff line
@@ -1481,6 +1481,18 @@ config RCU_CPU_STALL_TIMEOUT 
	  RCU grace period persists, additional CPU stall warnings are

	  printed at more widely spaced intervals.



config RCU_PANIC_ON_STALL

	int "Panic on RCU Stalls"

	range 0 1

	default 0

	depends on RCU_STALL_COMMON

	help

	  Panic if a given RCU grace period extends more than the specified

	  number of seconds instead of just printing a CPU stall warning.

	  This helps to collect cpu context as part of ramdumps for post

	  mortem analysis.





config RCU_TRACE

	bool "Enable tracing for RCU"

	depends on DEBUG_KERNEL