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mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using

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Drop kmem_alloc event class, and define kmalloc and kmem_cache_alloc
using TRACE_EVENT() macro.

And then this patch does:
   - Do not pass pointer to struct kmem_cache to trace_kmalloc.
     gfp flag is enough to know if it's accounted or not.
   - Avoid dereferencing s->object_size and s->size when not using kmem_cache_alloc event.
   - Avoid dereferencing s->name in when not using kmem_cache_free event.
   - Adjust s->size to SLOB_UNITS(s->size) * SLOB_UNIT in SLOB

Cc: Vasily Averin <vasily.averin@linux.dev>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Hyeonggon Yoo 2022-08-17 19:18:24 +09:00 • committed by Vlastimil Babka
parent 11e9734bcb
commit 2c1d697fb8
5 changed files with 64 additions and 51 deletions
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8
mm/slab.c
View file

@ -3440,8 +3440,7 @@ void *__kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *lru,
{
void *ret = slab_alloc(cachep, lru, flags, cachep->object_size, _RET_IP_);
trace_kmem_cache_alloc(_RET_IP_, ret, cachep, cachep->object_size,
cachep->size, flags, NUMA_NO_NODE);
trace_kmem_cache_alloc(_RET_IP_, ret, cachep, flags, NUMA_NO_NODE);
return ret;
}
@ -3536,8 +3535,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
{
void *ret = slab_alloc_node(cachep, NULL, flags, nodeid, cachep->object_size, _RET_IP_);
trace_kmem_cache_alloc(_RET_IP_, ret, cachep, cachep->object_size,
cachep->size, flags, nodeid);
trace_kmem_cache_alloc(_RET_IP_, ret, cachep, flags, nodeid);
return ret;
}
@ -3607,7 +3605,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
if (!cachep)
return;
trace_kmem_cache_free(_RET_IP_, objp, cachep->name);
trace_kmem_cache_free(_RET_IP_, objp, cachep);
__do_kmem_cache_free(cachep, objp, _RET_IP_);
}
EXPORT_SYMBOL(kmem_cache_free);