At Fri, 22 Jun 2007 09:56:35 -0500,
Matt Mackall wrote:
>
> On Fri, Jun 22, 2007 at 05:08:07PM +0900, Yoshinori Sato wrote:
> > Because the page which SLOB allocator got does not have PG_slab,
>
> This is for a NOMMU system?
Yes.
> You're using an old kernel with an old version of SLOB. SLOB in newer
> kernels actually sets per-page flags. Nick, can you see any reason not
> to s/PG_active/PG_slab/ in the current code?
in mm/nommu.c
109 unsigned int kobjsize(const void *objp)
110 {
:
116 if (PageSlab(page))
117 return ksize(objp);
:
122 return (PAGE_SIZE << page->index);
123 }
PG_slab is verified here.
> > Signed-off-by: Yoshinori Sato <[email protected]>
> >
> > diff --git a/mm/slob.c b/mm/slob.c
> > index 71976c5..d10bcda 100644
> > --- a/mm/slob.c
> > +++ b/mm/slob.c
> > @@ -73,6 +73,21 @@ static DEFINE_SPINLOCK(block_lock);
> > static void slob_free(void *b, int size);
> > static void slob_timer_cbk(void);
> >
> > +static inline void set_slabflags(const void *ptr, int order)
> > +{
> > + int i;
> > + struct page *page = virt_to_page(ptr);
> > + for (i = 0; i < (1 << order); i++)
> > + __SetPageSlab(page++);
> > +}
> > +
> > +static inline void clear_slabflags(const void *ptr, int order)
> > +{
> > + int i;
> > + struct page *page = virt_to_page(ptr);
> > + for (i = 0; i < (1 << order); i++)
> > + __ClearPageSlab(page++);
> > +}
> >
> > static void *slob_alloc(size_t size, gfp_t gfp, int align)
> > {
> > @@ -180,6 +195,7 @@ void *__kmalloc(size_t size, gfp_t gfp)
> > bb->pages = (void *)__get_free_pages(gfp, bb->order);
> >
> > if (bb->pages) {
> > + set_slabflags(bb->pages, bb->order);
> > spin_lock_irqsave(&block_lock, flags);
> > bb->next = bigblocks;
> > bigblocks = bb;
> > @@ -240,6 +256,7 @@ void kfree(const void *block)
> > if (bb->pages == block) {
> > *last = bb->next;
> > spin_unlock_irqrestore(&block_lock, flags);
> > + clear_slabflags(block, bb->order);
> > free_pages((unsigned long)block, bb->order);
> > slob_free(bb, sizeof(bigblock_t));
> > return;
> > @@ -323,9 +340,11 @@ void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags)
> >
> > if (c->size < PAGE_SIZE)
> > b = slob_alloc(c->size, flags, c->align);
> > - else
> > + else {
> > b = (void *)__get_free_pages(flags, get_order(c->size));
> > -
> > + if (b)
> > + set_slabflags(b, get_order(c->size));
> > + }
> > if (c->ctor)
> > c->ctor(b, c, 0);
> >
> > @@ -347,8 +366,10 @@ static void __kmem_cache_free(void *b, int size)
> > {
> > if (size < PAGE_SIZE)
> > slob_free(b, size);
> > - else
> > + else {
> > + clear_slabflags(b, get_order(size));
> > free_pages((unsigned long)b, get_order(size));
> > + }
> > }
> >
> > static void kmem_rcu_free(struct rcu_head *head)
>
> --
> Mathematics is the supreme nostalgia of our time.
-
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