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[PATCH] Extract the allocpercpu functions from the slab allocator

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The allocpercpu functions __alloc_percpu and __free_percpu() are heavily
using the slab allocator.  However, they are conceptually slab.  This also
simplifies SLOB (at this point slob may be broken in mm.  This should fix
it).

Signed-off-by: Christoph Lameter <[email protected]>
Cc: Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2006-09-25 23:31:50 -07:00 • committed by Linus Torvalds
commit d00bcc98d7
4 changed files with 130 additions and 170 deletions
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45
mm/slob.c
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@ -343,48 +343,3 @@ void kmem_cache_init(void)
atomic_t slab_reclaim_pages = ATOMIC_INIT(0);
EXPORT_SYMBOL(slab_reclaim_pages);
#ifdef CONFIG_SMP
void *__alloc_percpu(size_t size)
{
int i;
struct percpu_data *pdata = kmalloc(sizeof (*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
for_each_possible_cpu(i) {
pdata->ptrs[i] = kmalloc(size, GFP_KERNEL);
if (!pdata->ptrs[i])
goto unwind_oom;
memset(pdata->ptrs[i], 0, size);
}
/* Catch derefs w/o wrappers */
return (void *) (~(unsigned long) pdata);
unwind_oom:
while (--i >= 0) {
if (!cpu_possible(i))
continue;
kfree(pdata->ptrs[i]);
}
kfree(pdata);
return NULL;
}
EXPORT_SYMBOL(__alloc_percpu);
void
free_percpu(const void *objp)
{
int i;
struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp);
for_each_possible_cpu(i)
kfree(p->ptrs[i]);
kfree(p);
}
EXPORT_SYMBOL(free_percpu);
#endif