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rcu: merge TREE_PREEPT_RCU blocked_tasks[] lists

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Combine the current TREE_PREEMPT_RCU ->blocked_tasks[] lists in the
rcu_node structure into a single ->blkd_tasks list with ->gp_tasks
and ->exp_tasks tail pointers.  This is in preparation for RCU priority
boosting, which will add a third dimension to the combinatorial explosion
in the ->blocked_tasks[] case, but simply a third pointer in the new
->blkd_tasks case.

Also update documentation to reflect blocked_tasks[] merge

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney
2010-11-29 21:56:39 -08:00
committed by Paul E. McKenney
parent e59fb3120b
commit 12f5f524ca
5 changed files with 135 additions and 94 deletions
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11
kernel/rcutree_trace.c
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@@ -161,7 +161,6 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
{
unsigned long gpnum;
int level = 0;
int phase;
struct rcu_node *rnp;
gpnum = rsp->gpnum;
@@ -178,13 +177,11 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
seq_puts(m, "\n");
level = rnp->level;
}
phase = gpnum & 0x1;
seq_printf(m, "%lx/%lx %c%c>%c%c %d:%d ^%d ",
seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
rnp->qsmask, rnp->qsmaskinit,
"T."[list_empty(&rnp->blocked_tasks[phase])],
"E."[list_empty(&rnp->blocked_tasks[phase + 2])],
"T."[list_empty(&rnp->blocked_tasks[!phase])],
"E."[list_empty(&rnp->blocked_tasks[!phase + 2])],
".G"[rnp->gp_tasks != NULL],
".E"[rnp->exp_tasks != NULL],
".T"[!list_empty(&rnp->blkd_tasks)],
rnp->grplo, rnp->grphi, rnp->grpnum);
}
seq_puts(m, "\n");