Commit 3ddf20c9 authored by Paul E. McKenney's avatar Paul E. McKenney

srcu: Shrink Tiny SRCU a bit more

This commit rearranges Tiny SRCU's srcu_struct structure, substitutes
u8 for bool, and shrinks counters down to short.
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 41f36481
...@@ -27,15 +27,15 @@ ...@@ -27,15 +27,15 @@
#include <linux/swait.h> #include <linux/swait.h>
struct srcu_struct { struct srcu_struct {
int srcu_lock_nesting[2]; /* srcu_read_lock() nesting depth. */ short srcu_lock_nesting[2]; /* srcu_read_lock() nesting depth. */
short srcu_idx; /* Current reader array element. */
u8 srcu_gp_running; /* GP workqueue running? */
u8 srcu_gp_waiting; /* GP waiting for readers? */
struct swait_queue_head srcu_wq; struct swait_queue_head srcu_wq;
/* Last srcu_read_unlock() wakes GP. */ /* Last srcu_read_unlock() wakes GP. */
unsigned long srcu_gp_seq; /* GP seq # for callback tagging. */ unsigned long srcu_gp_seq; /* GP seq # for callback tagging. */
struct rcu_segcblist srcu_cblist; struct rcu_segcblist srcu_cblist;
/* Pending SRCU callbacks. */ /* Pending SRCU callbacks. */
int srcu_idx; /* Current reader array element. */
bool srcu_gp_running; /* GP workqueue running? */
bool srcu_gp_waiting; /* GP waiting for readers? */
struct work_struct srcu_work; /* For driving grace periods. */ struct work_struct srcu_work; /* For driving grace periods. */
#ifdef CONFIG_DEBUG_LOCK_ALLOC #ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map; struct lockdep_map dep_map;
......
...@@ -609,7 +609,7 @@ static void srcu_torture_stats(void) ...@@ -609,7 +609,7 @@ static void srcu_torture_stats(void)
pr_cont("\n"); pr_cont("\n");
#elif defined(CONFIG_TINY_SRCU) #elif defined(CONFIG_TINY_SRCU)
idx = READ_ONCE(srcu_ctlp->srcu_idx) & 0x1; idx = READ_ONCE(srcu_ctlp->srcu_idx) & 0x1;
pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%d,%d)\n", pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd)\n",
torture_type, TORTURE_FLAG, idx, torture_type, TORTURE_FLAG, idx,
READ_ONCE(srcu_ctlp->srcu_lock_nesting[!idx]), READ_ONCE(srcu_ctlp->srcu_lock_nesting[!idx]),
READ_ONCE(srcu_ctlp->srcu_lock_nesting[idx])); READ_ONCE(srcu_ctlp->srcu_lock_nesting[idx]));
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment