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From: Liam Howlett <liam.howlett@oracle.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	Matthew Wilcox <willy@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Subject: [PATCH v2 2/4] radix tree test suite: Add kmem_cache_set_non_kernel()
Date: Thu, 3 Jun 2021 18:47:45 +0000	[thread overview]
Message-ID: <20210603184729.3893455-3-Liam.Howlett@Oracle.com> (raw)
In-Reply-To: <20210603184729.3893455-1-Liam.Howlett@Oracle.com>

kmem_cache_set_non_kernel() is a mechanism to allow a certain number of
kmem_cache_alloc requests to succeed even when GFP_KERNEL is not set in
the flags.  This functionality allows for testing different paths though
the code.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 tools/testing/radix-tree/linux.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
index 2d9c59df60de..00ee01a14652 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -24,14 +24,24 @@ struct kmem_cache {
 	int nr_objs;
 	void *objs;
 	void (*ctor)(void *);
+	unsigned int non_kernel;
 };
 
+void kmem_cache_set_non_kernel(struct kmem_cache *cachep, unsigned int val)
+{
+	cachep->non_kernel = val;
+}
+
 void *kmem_cache_alloc(struct kmem_cache *cachep, int gfp)
 {
 	void *p;
 
-	if (!(gfp & __GFP_DIRECT_RECLAIM))
-		return NULL;
+	if (!(gfp & __GFP_DIRECT_RECLAIM)) {
+		if (!cachep->non_kernel)
+			return NULL;
+
+		cachep->non_kernel--;
+	}
 
 	pthread_mutex_lock(&cachep->lock);
 	if (cachep->nr_objs) {
@@ -116,5 +126,6 @@ kmem_cache_create(const char *name, unsigned int size, unsigned int align,
 	ret->nr_objs = 0;
 	ret->objs = NULL;
 	ret->ctor = ctor;
+	ret->non_kernel = 0;
 	return ret;
 }
-- 
2.30.2

  parent reply	other threads:[~2021-06-03 18:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 18:47 [PATCH v2 0/4] radix tree test framework additions Liam Howlett
2021-06-03 18:47 ` [PATCH v2 1/4] radix tree test suite: Add pr_err define Liam Howlett
2021-06-03 18:47 ` Liam Howlett [this message]
2021-06-03 18:47 ` [PATCH v2 4/4] radix tree test suite: Add support for slab bulk APIs Liam Howlett
2021-06-03 18:47 ` [PATCH v2 3/4] radix tree test suite: Add allocation counts and size to kmem_cache Liam Howlett

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