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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: "Will Deacon" <will@kernel.org>,
	linux-rdma@vger.kernel.org,
	"Daniel Vetter" <daniel.vetter@ffwll.ch>,
	"Intel Graphics Development" <intel-gfx@lists.freedesktop.org>,
	"Dave Chinner" <david@fromorbit.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"Matthew Wilcox (Oracle)" <willy@infradead.org>,
	"Christian König" <christian.koenig@amd.com>,
	linux-xfs@vger.kernel.org, linux-mm@kvack.org,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Jason Gunthorpe" <jgg@mellanox.com>, "Qian Cai" <cai@lca.pw>,
	linux-fsdevel@vger.kernel.org,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Thomas Hellström" <thomas_os@shipmail.org>
Subject: [PATCH 3/3] locking/selftests: Add testcases for fs_reclaim
Date: Fri, 20 Nov 2020 10:54:44 +0100
Message-ID: <20201120095445.1195585-4-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <20201120095445.1195585-1-daniel.vetter@ffwll.ch>

Since I butchered this I figured better to make sure we have testcases
for this now. Since we only have a locking context for __GFP_FS that's
the only thing we're testing right now.

Cc: linux-fsdevel@vger.kernel.org
Cc: Dave Chinner <david@fromorbit.com>
Cc: Qian Cai <cai@lca.pw>
Cc: linux-xfs@vger.kernel.org
Cc: Thomas Hellström (Intel) <thomas_os@shipmail.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: linux-mm@kvack.org
Cc: linux-rdma@vger.kernel.org
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-kernel@vger.kernel.org
---
 lib/locking-selftest.c | 47 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index a899b3f0e2e5..ad47c3358e30 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -15,6 +15,7 @@
 #include <linux/mutex.h>
 #include <linux/ww_mutex.h>
 #include <linux/sched.h>
+#include <linux/sched/mm.h>
 #include <linux/delay.h>
 #include <linux/lockdep.h>
 #include <linux/spinlock.h>
@@ -2357,6 +2358,50 @@ static void queued_read_lock_tests(void)
 	pr_cont("\n");
 }
 
+static void fs_reclaim_correct_nesting(void)
+{
+	fs_reclaim_acquire(GFP_KERNEL);
+	might_alloc(GFP_NOFS);
+	fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_wrong_nesting(void)
+{
+	fs_reclaim_acquire(GFP_KERNEL);
+	might_alloc(GFP_KERNEL);
+	fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_protected_nesting(void)
+{
+	unsigned int flags;
+
+	fs_reclaim_acquire(GFP_KERNEL);
+	flags = memalloc_nofs_save();
+	might_alloc(GFP_KERNEL);
+	memalloc_nofs_restore(flags);
+	fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_tests(void)
+{
+	printk("  --------------------\n");
+	printk("  | fs_reclaim tests |\n");
+	printk("  --------------------\n");
+
+	print_testname("correct nesting");
+	dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
+	pr_cont("\n");
+
+	print_testname("wrong nesting");
+	dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
+	pr_cont("\n");
+
+	print_testname("protected nesting");
+	dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
+	pr_cont("\n");
+}
+
 void locking_selftest(void)
 {
 	/*
@@ -2478,6 +2523,8 @@ void locking_selftest(void)
 	if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
 		queued_read_lock_tests();
 
+	fs_reclaim_tests();
+
 	if (unexpected_testcase_failures) {
 		printk("-----------------------------------------------------------------\n");
 		debug_locks = 0;
-- 
2.29.2

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  parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20  9:54 [PATCH 0/3] mmu_notifier fs fs_reclaim lockdep annotations Daniel Vetter
2020-11-20  9:54 ` [PATCH 1/3] mm: Track mmu notifiers in fs_reclaim_acquire/release Daniel Vetter
2020-11-20 18:23   ` Jason Gunthorpe
2020-11-20  9:54 ` [PATCH 2/3] mm: Extract might_alloc() debug check Daniel Vetter
2020-11-20 17:19   ` Randy Dunlap
2020-11-20 17:31     ` Daniel Vetter
2020-11-20 18:07   ` Jason Gunthorpe
2020-11-24 14:34     ` Daniel Vetter
2020-11-24 15:27       ` Jason Gunthorpe
2020-11-20  9:54 ` Daniel Vetter [this message]
2020-11-20 12:31   ` [PATCH 3/3] locking/selftests: Add testcases for fs_reclaim Peter Zijlstra
2020-11-20  9:54 ` [PATCH] drm/ttm: don't set page->mapping Daniel Vetter
2020-11-20 10:04   ` Christian König
2020-11-20 10:05     ` Daniel Vetter
2020-11-20 10:08       ` Christian König
2020-11-20 15:01         ` Daniel Vetter

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