linux-kernel - [PATCH] kmemleak: record accurate early log buffer count and report when exceeded

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Date:	Wed, 15 Apr 2015 19:49:23 +0800
From:	Wang Kai <morgan.wang@...wei.com>
To:	<catalin.marinas@....com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] kmemleak: record accurate early log buffer count and report when exceeded

In log_early function, crt_early_log should also count once when
'crt_early_log >= ARRAY_SIZE(early_log)'. Otherwise the reported
count from kmemleak_init is one less than 'actual number'.

Then, in kmemleak_init, if early_log buffer size equal actual
number, kmemleak will init sucessful, so change warning condition
to 'crt_early_log > ARRAY_SIZE(early_log)'.

Signed-off-by: Wang Kai <morgan.wang@...wei.com>
---
 mm/kmemleak.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 5405aff..49956cf 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -814,6 +814,8 @@ static void __init log_early(int op_type, const void *ptr, size_t size,
 	}
 
 	if (crt_early_log >= ARRAY_SIZE(early_log)) {
+		/* kmemleak will stop recording, just count the requests */
+		crt_early_log++;
 		kmemleak_disable();
 		return;
 	}
@@ -1829,7 +1831,8 @@ void __init kmemleak_init(void)
 	object_cache = KMEM_CACHE(kmemleak_object, SLAB_NOLEAKTRACE);
 	scan_area_cache = KMEM_CACHE(kmemleak_scan_area, SLAB_NOLEAKTRACE);
 
-	if (crt_early_log >= ARRAY_SIZE(early_log))
+	/* Don't warning when crt_early_log == ARRAY_SIZE(early_log) */
+	if (crt_early_log > ARRAY_SIZE(early_log))
 		pr_warning("Early log buffer exceeded (%d), please increase "
 			   "DEBUG_KMEMLEAK_EARLY_LOG_SIZE\n", crt_early_log);
 
-- 
1.7.9.5

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