* PG_slab?
@ 2004-09-20 20:09 Marcelo Tosatti
2004-09-20 22:31 ` PG_slab? Paul Jackson
0 siblings, 1 reply; 3+ messages in thread
From: Marcelo Tosatti @ 2004-09-20 20:09 UTC (permalink / raw)
To: linux-mm
Hi MM fellows,
What is PG_slab about?
#define PG_slab 7 /* slab debug (Suparna wants this) */
Its not used by SLAB though:
[marcelo@xeon mm]$ grep -A5 -B5 PG_slab page_alloc.c
1 << PG_lru |
1 << PG_private |
1 << PG_locked |
1 << PG_active |
1 << PG_reclaim |
1 << PG_slab |
1 << PG_swapcache |
1 << PG_writeback )))
bad_page(function, page);
if (PageDirty(page))
ClearPageDirty(page);
[marcelo@xeon mm]$
I suppose it was used by someone sometime ago but its not anymore?
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: PG_slab?
2004-09-20 20:09 PG_slab? Marcelo Tosatti
@ 2004-09-20 22:31 ` Paul Jackson
2004-09-21 15:36 ` PG_slab? Sean Neakums
0 siblings, 1 reply; 3+ messages in thread
From: Paul Jackson @ 2004-09-20 22:31 UTC (permalink / raw)
To: Marcelo Tosatti; +Cc: linux-mm
Marcelo writes:
> What is PG_slab about?
A grep in a 2.6.0-mm1 I have expanded shows that its some slab debug
stuff that Suparna wanted. The last grep at the bottom of this display
is in the routine mm/slab.c: ptrinfo(), that dumps data about some
address.
arch/arm/mm/init.c- cached++;
arch/arm/mm/init.c: else if (PageSlab(page))
arch/arm/mm/init.c- slab++;
--
arch/arm26/mm/init.c- cached++;
arch/arm26/mm/init.c: else if (PageSlab(page))
arch/arm26/mm/init.c- slab++;
include/linux/page-flags.h-#define PG_active 6
include/linux/page-flags.h:#define PG_slab 7 /* slab debug (Suparna wants this) */
include/linux/page-flags.h-
--
include/linux/page-flags.h-
include/linux/page-flags.h:#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
include/linux/page-flags.h:#define SetPageSlab(page) set_bit(PG_slab, &(page)->flags)
include/linux/page-flags.h:#define ClearPageSlab(page) clear_bit(PG_slab, &(page)->flags)
include/linux/page-flags.h:#define TestClearPageSlab(page) test_and_clear_bit(PG_slab, &(page)->flags)
include/linux/page-flags.h:#define TestSetPageSlab(page) test_and_set_bit(PG_slab, &(page)->flags)
include/linux/page-flags.h-
mm/nommu.c-
mm/nommu.c: if (PageSlab(page))
mm/nommu.c- return ksize(objp);
--
mm/page_alloc.c- 1 << PG_reclaim |
mm/page_alloc.c: 1 << PG_slab |
mm/page_alloc.c- 1 << PG_writeback )))
--
mm/slab.c- add_page_state(nr_slab, i);
mm/slab.c- while (i--) {
mm/slab.c: SetPageSlab(page);
mm/slab.c- page++;
mm/slab.c- }
--
mm/slab.c-
mm/slab.c- while (i--) {
mm/slab.c: if (!TestClearPageSlab(page))
mm/slab.c- BUG();
mm/slab.c- page++;
--
mm/slab.c- }
mm/slab.c- page = virt_to_page(objp);
mm/slab.c: if (!PageSlab(page)) {
mm/slab.c- printk(KERN_ERR "kfree_debugcheck: bad ptr %lxh.\n", (unsigned long)objp);
mm/slab.c- BUG();
--
mm/slab.c- page = virt_to_page((void*)addr);
mm/slab.c- printk("struct page at %p, flags %lxh.\n", page, page->flags);
mm/slab.c: if (PageSlab(page)) {
mm/slab.c- kmem_cache_t *c;
mm/slab.c- struct slab *s;
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.650.933.1373
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: PG_slab?
2004-09-20 22:31 ` PG_slab? Paul Jackson
@ 2004-09-21 15:36 ` Sean Neakums
0 siblings, 0 replies; 3+ messages in thread
From: Sean Neakums @ 2004-09-21 15:36 UTC (permalink / raw)
To: Paul Jackson; +Cc: Marcelo Tosatti, linux-mm
Paul Jackson <pj@sgi.com> writes:
> Marcelo writes:
>> What is PG_slab about?
>
> A grep in a 2.6.0-mm1 I have expanded shows that its some slab debug
> stuff that Suparna wanted. The last grep at the bottom of this display
> is in the routine mm/slab.c: ptrinfo(), that dumps data about some
> address.
I guess this patch or something like it was merged:
Date: Wed, 1 Sep 2004 12:02:23 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: [PATCH] remove ptrinfo
http://lkml.org/lkml/2004/9/1/70
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^ permalink raw reply [flat|nested] 3+ messages in thread
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