The patch titled
srcu: add SRCU operations to rcutorture
has been added to the -mm tree. Its filename is
srcu-add-srcu-operations-to-rcutorture.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: srcu: add SRCU operations to rcutorture
From: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Adds SRCU operations to rcutorture and updates rcutorture documentation.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
Documentation/RCU/torture.txt | 15 +++++
kernel/rcutorture.c | 89 ++++++++++++++++++++++++++++++--
2 files changed, 101 insertions(+), 3 deletions(-)
diff -puN Documentation/RCU/torture.txt~srcu-add-srcu-operations-to-rcutorture Documentation/RCU/torture.txt
--- a/Documentation/RCU/torture.txt~srcu-add-srcu-operations-to-rcutorture
+++ a/Documentation/RCU/torture.txt
@@ -118,6 +118,21 @@ o "Free-Block Circulation": Shows the nu
as it is only incremented if a torture structure's counter
somehow gets incremented farther than it should.
+Different implementations of RCU can provide implementation-specific
+additional information. For example, SRCU provides the following:
+
+ srcu-torture: rtc: f8cf46a8 ver: 355 tfle: 0 rta: 356 rtaf: 0 rtf: 346 rtmbe: 0
+ srcu-torture: Reader Pipe: 559738 939 0 0 0 0 0 0 0 0 0
+ srcu-torture: Reader Batch: 560434 243 0 0 0 0 0 0 0 0
+ srcu-torture: Free-Block Circulation: 355 354 353 352 351 350 349 348 347 346 0
+ srcu-torture: per-CPU(idx=1): 0(0,1) 1(0,1) 2(0,0) 3(0,1)
+
+The first four lines are similar to those for RCU. The last line shows
+the per-CPU counter state. The numbers in parentheses are the values
+of the "old" and "current" counters for the corresponding CPU. The
+"idx" value maps the "old" and "current" values to the underlying array,
+and is useful for debugging.
+
USAGE
diff -puN kernel/rcutorture.c~srcu-add-srcu-operations-to-rcutorture kernel/rcutorture.c
--- a/kernel/rcutorture.c~srcu-add-srcu-operations-to-rcutorture
+++ a/kernel/rcutorture.c
@@ -44,6 +44,7 @@
#include <linux/delay.h>
#include <linux/byteorder/swabb.h>
#include <linux/stat.h>
+#include <linux/srcu.h>
MODULE_LICENSE("GPL");
@@ -53,7 +54,7 @@ static int stat_interval; /* Interval be
static int verbose; /* Print more debug info. */
static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */
static int shuffle_interval = 5; /* Interval between shuffles (in sec)*/
-static char *torture_type = "rcu"; /* What to torture. */
+static char *torture_type = "rcu"; /* What to torture: rcu, srcu. */
module_param(nreaders, int, 0);
MODULE_PARM_DESC(nreaders, "Number of RCU reader threads");
@@ -66,7 +67,7 @@ MODULE_PARM_DESC(test_no_idle_hz, "Test
module_param(shuffle_interval, int, 0);
MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles");
module_param(torture_type, charp, 0);
-MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh)");
+MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)");
#define TORTURE_FLAG "-torture:"
#define PRINTK_STRING(s) \
@@ -282,8 +283,90 @@ static struct rcu_torture_ops rcu_bh_ops
.name = "rcu_bh"
};
+/*
+ * Definitions for srcu torture testing.
+ */
+
+static struct srcu_struct srcu_ctl;
+static struct list_head srcu_removed;
+
+static void srcu_torture_init(void)
+{
+ init_srcu_struct(&srcu_ctl);
+ INIT_LIST_HEAD(&srcu_removed);
+}
+
+static void srcu_torture_cleanup(void)
+{
+ synchronize_srcu(&srcu_ctl);
+ cleanup_srcu_struct(&srcu_ctl);
+}
+
+static int srcu_torture_read_lock(void)
+{
+ return (srcu_read_lock(&srcu_ctl));
+}
+
+static void srcu_torture_read_unlock(int idx)
+{
+ srcu_read_unlock(&srcu_ctl, idx);
+}
+
+static int srcu_torture_completed(void)
+{
+ return srcu_batches_completed(&srcu_ctl);
+}
+
+static void srcu_torture_deferred_free(struct rcu_torture *p)
+{
+ int i;
+ struct rcu_torture *rp;
+ struct rcu_torture *rp1;
+
+ synchronize_srcu(&srcu_ctl);
+ list_add(&p->rtort_free, &srcu_removed);
+ list_for_each_entry_safe(rp, rp1, &srcu_removed, rtort_free) {
+ i = rp->rtort_pipe_count;
+ if (i > RCU_TORTURE_PIPE_LEN)
+ i = RCU_TORTURE_PIPE_LEN;
+ atomic_inc(&rcu_torture_wcount[i]);
+ if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) {
+ rp->rtort_mbtest = 0;
+ list_del(&rp->rtort_free);
+ rcu_torture_free(rp);
+ }
+ }
+}
+
+int srcu_torture_stats(char *page)
+{
+ int cnt = 0;
+ int cpu;
+ int idx = srcu_ctl.completed & 0x1;
+
+ cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", torture_type, TORTURE_FLAG, idx);
+ for_each_cpu(cpu) {
+ cnt += sprintf(&page[cnt], " %d(%d,%d)", cpu,
+ srcu_ctl.per_cpu_ref[cpu].c[!idx],
+ srcu_ctl.per_cpu_ref[cpu].c[idx]);
+ }
+ cnt += sprintf(&page[cnt], "\n");
+ return (cnt);
+}
+
+static struct rcu_torture_ops srcu_ops = {
+ .init = srcu_torture_init,
+ .cleanup = srcu_torture_cleanup,
+ .readlock = srcu_torture_read_lock,
+ .readunlock = srcu_torture_read_unlock,
+ .completed = srcu_torture_completed,
+ .deferredfree = srcu_torture_deferred_free,
+ .stats = srcu_torture_stats,
+ .name = "srcu"
+};
+
static struct rcu_torture_ops *torture_ops[] =
- { &rcu_ops, &rcu_bh_ops, NULL };
+ { &rcu_ops, &rcu_bh_ops, &srcu_ops, NULL };
/*
* RCU torture writer kthread. Repeatedly substitutes a new structure
_
Patches currently in -mm which might be from paulmck@xxxxxxxxxx are
origin.patch
radix-tree-rcu-lockless-readside.patch
adix-tree-rcu-lockless-readside-update.patch
rcutorture-catchup-doc-fixes-for-idle-hz-tests.patch
rcutorture-add-ops-vector-and-classic-rcu-ops.patch
rcutorture-add-call_rcu_bh-operations.patch
srcu-rcu-variant-permitting-read-side-blocking.patch
srcu-add-srcu-operations-to-rcutorture.patch
-
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