From: Boqun Feng <boqun.feng@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Gautham R Shenoy <ego@in.ibm.com>,
Byungchul Park <byungchul.park@lge.com>,
Boqun Feng <boqun.feng@gmail.com>
Subject: [RFC tip 2/5] lockdep/selftest: Add more recursive read related test cases
Date: Mon, 28 Aug 2017 22:56:54 +0800 [thread overview]
Message-ID: <20170828145657.11292-3-boqun.feng@gmail.com> (raw)
In-Reply-To: <20170828145657.11292-1-boqun.feng@gmail.com>
Add those four test cases:
1.
CPU1 CPU2 CPU3
============= ============= =============
write_lock(X);
write_lock(Y);
write_lock(Z);
read_lock(Y);
read_lock(Z);
read_lock(X);
deadlock.
2.
CPU1 CPU2 CPU3
============= ============= =============
write_lock(X);
read_lock(Y);
write_lock(Z);
write_lock(Y);
read_lock(Z);
read_lock(X);
deadlock.
3.
CPU1 CPU2 CPU3
============= ============= =============
write_lock(X);
read_lock(Y);
read_lock(Z);
write_lock(Y);
read_lock(Z);
write_lock(X);
not deadlock.
4.
CPU1 CPU2 CPU3
============= ============= =============
write_lock(X);
read_lock(Y);
write_lock(Z);
read_lock(Y);
read_lock(Z);
write_lock(X);
not deadlock.
Those self testcases are valuable for the development of supporting
recursive read related deadlock detection.
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
---
lib/locking-selftest.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 161 insertions(+)
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 747a5379aeee..9c04b304008a 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -1070,6 +1070,133 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft)
#undef E2
#undef E3
+/*
+ * write-read / write-read / write-read deadlock even if read is recursive
+ */
+
+#define E1() \
+ \
+ WL(X1); \
+ RL(Y1); \
+ RU(Y1); \
+ WU(X1);
+
+#define E2() \
+ \
+ WL(Y1); \
+ RL(Z1); \
+ RU(Z1); \
+ WU(Y1);
+
+#define E3() \
+ \
+ WL(Z1); \
+ RL(X1); \
+ RU(X1); \
+ WU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-write / read-read / write-read deadlock even if read is recursive
+ */
+
+#define E1() \
+ \
+ WL(X1); \
+ WL(Y1); \
+ WU(Y1); \
+ WU(X1);
+
+#define E2() \
+ \
+ RL(Y1); \
+ RL(Z1); \
+ RU(Z1); \
+ RU(Y1);
+
+#define E3() \
+ \
+ WL(Z1); \
+ RL(X1); \
+ RU(X1); \
+ WU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-write / read-read / read-write is not deadlock when read is recursive
+ */
+
+#define E1() \
+ \
+ WL(X1); \
+ WL(Y1); \
+ WU(Y1); \
+ WU(X1);
+
+#define E2() \
+ \
+ RL(Y1); \
+ RL(Z1); \
+ RU(Z1); \
+ RU(Y1);
+
+#define E3() \
+ \
+ RL(Z1); \
+ WL(X1); \
+ WU(X1); \
+ RU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-read / read-read / write-write is not deadlock when read is recursive
+ */
+
+#define E1() \
+ \
+ WL(X1); \
+ RL(Y1); \
+ RU(Y1); \
+ WU(X1);
+
+#define E2() \
+ \
+ RL(Y1); \
+ RL(Z1); \
+ RU(Z1); \
+ RU(Y1);
+
+#define E3() \
+ \
+ WL(Z1); \
+ WL(X1); \
+ WU(X1); \
+ WU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
+
+#undef E1
+#undef E2
+#undef E3
/*
* read-lock / write-lock recursion that is unsafe.
*/
@@ -1241,6 +1368,19 @@ static inline void print_testname(const char *testname)
dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
pr_cont("\n");
+#define DO_TESTCASE_1RR(desc, name, nr) \
+ print_testname(desc"/"#nr); \
+ pr_cont(" |"); \
+ dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
+ pr_cont("\n");
+
+#define DO_TESTCASE_1RRB(desc, name, nr) \
+ print_testname(desc"/"#nr); \
+ pr_cont(" |"); \
+ dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
+ pr_cont("\n");
+
+
#define DO_TESTCASE_3(desc, name, nr) \
print_testname(desc"/"#nr); \
dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \
@@ -1331,6 +1471,22 @@ static inline void print_testname(const char *testname)
DO_TESTCASE_2IB(desc, name, 312); \
DO_TESTCASE_2IB(desc, name, 321);
+#define DO_TESTCASE_6x1RR(desc, name) \
+ DO_TESTCASE_1RR(desc, name, 123); \
+ DO_TESTCASE_1RR(desc, name, 132); \
+ DO_TESTCASE_1RR(desc, name, 213); \
+ DO_TESTCASE_1RR(desc, name, 231); \
+ DO_TESTCASE_1RR(desc, name, 312); \
+ DO_TESTCASE_1RR(desc, name, 321);
+
+#define DO_TESTCASE_6x1RRB(desc, name) \
+ DO_TESTCASE_1RRB(desc, name, 123); \
+ DO_TESTCASE_1RRB(desc, name, 132); \
+ DO_TESTCASE_1RRB(desc, name, 213); \
+ DO_TESTCASE_1RRB(desc, name, 231); \
+ DO_TESTCASE_1RRB(desc, name, 312); \
+ DO_TESTCASE_1RRB(desc, name, 321);
+
#define DO_TESTCASE_6x6(desc, name) \
DO_TESTCASE_6I(desc, name, 123); \
DO_TESTCASE_6I(desc, name, 132); \
@@ -2093,6 +2249,11 @@ void locking_selftest(void)
pr_cont(" |");
dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
+ DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
+ DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
+ DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
+ DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
+
printk(" --------------------------------------------------------------------------\n");
/*
--
2.14.1
next prev parent reply other threads:[~2017-08-28 14:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-28 14:56 [RFC tip 0/5] lockdep: Support deadlock detection for recursive read locks Boqun Feng
2017-08-28 14:56 ` [RFC tip 1/5] lockdep/selftest: Add a R-L/L-W test case specific to chain cache behavior Boqun Feng
2017-08-28 14:56 ` Boqun Feng [this message]
2017-08-28 14:56 ` [RFC tip 3/5] lockdep: Demagic the return value of BFS Boqun Feng
2017-08-28 14:56 ` [RFC tip 4/5] lockdep: Support deadlock detection for recursive read locks in check_noncircular() Boqun Feng
2017-08-28 14:56 ` [RFC tip 5/5] lockdep: Take read/write status in consideration when generate chainkey Boqun Feng
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170828145657.11292-3-boqun.feng@gmail.com \
--to=boqun.feng@gmail.com \
--cc=byungchul.park@lge.com \
--cc=ego@in.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®