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mm, slub: dissolve new_slab_objects() into ___slab_alloc()

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The later patches will need more fine grained control over individual actions
in ___slab_alloc(), the only caller of new_slab_objects(), so dissolve it
there. This is a preparatory step with no functional change.

The only minor change is moving WARN_ON_ONCE() for using a constructor together
with __GFP_ZERO to new_slab(), which makes it somewhat less frequent, but still
able to catch a development change introducing a systematic misuse.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
This commit is contained in:
Vlastimil Babka 2021-05-11 13:01:34 +02:00
parent 2a904905ae
commit 53a0de06e5
1 changed files with 18 additions and 32 deletions
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50
mm/slub.c
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@ -1885,6 +1885,8 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
if (unlikely(flags & GFP_SLAB_BUG_MASK))
flags = kmalloc_fix_flags(flags);
WARN_ON_ONCE(s->ctor && (flags & __GFP_ZERO));
return allocate_slab(s,
flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
}
@ -2610,36 +2612,6 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
#endif
}
static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
int node, struct kmem_cache_cpu **pc)
{
void *freelist = NULL;
struct kmem_cache_cpu *c = *pc;
struct page *page;
WARN_ON_ONCE(s->ctor && (flags & __GFP_ZERO));
page = new_slab(s, flags, node);
if (page) {
c = raw_cpu_ptr(s->cpu_slab);
if (c->page)
flush_slab(s, c);
/*
* No other reference to the page yet so we can
* muck around with it freely without cmpxchg
*/
freelist = page->freelist;
page->freelist = NULL;
stat(s, ALLOC_SLAB);
c->page = page;
*pc = c;
}
return freelist;
}
static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags)
{
if (unlikely(PageSlabPfmemalloc(page)))
@ -2786,13 +2758,27 @@ new_slab:
if (freelist)
goto check_new_page;
freelist = new_slab_objects(s, gfpflags, node, &c);
page = new_slab(s, gfpflags, node);
if (unlikely(!freelist)) {
if (unlikely(!page)) {
slab_out_of_memory(s, gfpflags, node);
return NULL;
}
c = raw_cpu_ptr(s->cpu_slab);
if (c->page)
flush_slab(s, c);
/*
* No other reference to the page yet so we can
* muck around with it freely without cmpxchg
*/
freelist = page->freelist;
page->freelist = NULL;
stat(s, ALLOC_SLAB);
c->page = page;
check_new_page:
page = c->page;
if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags)))