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SubjectRe: quicklists confuse meminfo
On Wed, 26 Mar 2008 08:45:46 +0100 "Bart Van Assche" <bart.vanassche@gmail.com> wrote:

> On Fri, Mar 21, 2008 at 3:45 PM, Ingo Molnar <mingo@elte.hu> wrote:
> >
> > * Bart Van Assche <bart.vanassche@gmail.com> wrote:
> >
> > > Is anyone currently working on this
> > > (http://bugzilla.kernel.org/show_bug.cgi?id=9991) ? I think this
> > > should either be fixed or documented as a known issue.
> >
> > it should be fixed in latest -git (by commit 985a34bd75cc8c9) - can you
> > still see it?
>
> This issue is indeed fixed now, thanks (retested with kernel version
> 2.6.25-rc6-00333-ga4083c9-dirty). Where can I find the patch that
> fixed this issue ? A Google query for the commit ID returned only one
> result, and that was an URL that pointed to your e-mail.
>

commit 985a34bd75cc8c96e43f00dcdda7c3fdb51a3026
Author: Thomas Gleixner <tglx@linutronix.de>
Date: Sun Mar 9 13:14:37 2008 +0100

x86: remove quicklists

quicklists cause a serious memory leak on 32-bit x86,
as documented at:

http://bugzilla.kernel.org/show_bug.cgi?id=9991

the reason is that the quicklist pool is a special-purpose
cache that grows out of proportion. It is not accounted for
anywhere and users have no way to even realize that it's
the quicklists that are causing RAM usage spikes. It was
supposed to be a relatively small pool, but as demonstrated
by KOSAKI Motohiro, they can grow as large as:

Quicklists: 1194304 kB

given how much trouble this code has caused historically,
and given that Andrew objected to its introduction on x86
(years ago), the best option at this point is to remove them.

[ any performance benefits of caching constructed pgds should
be implemented in a more generic way (possibly within the page
allocator), while still allowing constructed pages to be
allocated by other workloads. ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f41c953..237fc12 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -66,9 +66,6 @@ config MMU
config ZONE_DMA
def_bool y

-config QUICKLIST
- def_bool X86_32
-
config SBUS
bool

diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index 73aba71..2f9e9af 100644
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -342,12 +342,16 @@ static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)

pgd_t *pgd_alloc(struct mm_struct *mm)
{
- pgd_t *pgd = quicklist_alloc(0, GFP_KERNEL, pgd_ctor);
+ pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);

- mm->pgd = pgd; /* so that alloc_pd can use it */
+ /* so that alloc_pd can use it */
+ mm->pgd = pgd;
+ if (pgd)
+ pgd_ctor(pgd);

if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
- quicklist_free(0, pgd_dtor, pgd);
+ pgd_dtor(pgd);
+ free_page((unsigned long)pgd);
pgd = NULL;
}

@@ -357,12 +361,8 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
pgd_mop_up_pmds(mm, pgd);
- quicklist_free(0, pgd_dtor, pgd);
-}
-
-void check_pgt_cache(void)
-{
- quicklist_trim(0, pgd_dtor, 25, 16);
+ pgd_dtor(pgd);
+ free_page((unsigned long)pgd);
}

void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
diff --git a/include/asm-x86/pgtable_32.h b/include/asm-x86/pgtable_32.h
index a842c72..4e6a0fc 100644
--- a/include/asm-x86/pgtable_32.h
+++ b/include/asm-x86/pgtable_32.h
@@ -26,10 +26,9 @@ struct mm_struct;
struct vm_area_struct;

extern pgd_t swapper_pg_dir[1024];
-extern struct kmem_cache *pmd_cache;
-void check_pgt_cache(void);

-static inline void pgtable_cache_init(void) {}
+static inline void pgtable_cache_init(void) { }
+static inline void check_pgt_cache(void) { }
void paging_init(void);




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