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radix tree test suite: add kmem_cache_set_non_kernel()

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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.

Link: https://lkml.kernel.org/r/20220906194824.2110408-4-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2022-09-06 19:48:40 +00:00 committed by Andrew Morton
parent fbeea9d117
commit e73cb368be
1 changed files with 14 additions and 2 deletions
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16
tools/testing/radix-tree/linux.c
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@ -23,15 +23,26 @@ 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_lru(struct kmem_cache *cachep, struct list_lru *lru,
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) {
@ -90,5 +101,6 @@ 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;
}