From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Andi Kleen <andi@firstfloor.org>,
Wu Fengguang <fengguang.wu@intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] introduce thp_ptep_get()
Date: Mon, 30 Jan 2012 14:24:56 -0500 [thread overview]
Message-ID: <1327951496-29186-1-git-send-email-n-horiguchi@ah.jp.nec.com> (raw)
In-Reply-To: <20120130152646.3f202259.kamezawa.hiroyu@jp.fujitsu.com>
On Mon, Jan 30, 2012 at 03:26:46PM +0900, KAMEZAWA Hiroyuki wrote:
> On Fri, 27 Jan 2012 18:02:52 -0500
> Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> wrote:
>
> > Casting pmd into pte_t to handle thp is strongly architecture dependent.
> > This patch introduces a new function to separate this dependency from
> > independent part.
> >
> > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> > Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> > ---
> > arch/x86/include/asm/pgtable.h | 5 +++++
> > fs/proc/task_mmu.c | 4 ++--
> > include/asm-generic/pgtable.h | 4 ++++
> > 3 files changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git 3.3-rc1.orig/arch/x86/include/asm/pgtable.h 3.3-rc1/arch/x86/include/asm/pgtable.h
> > index 49afb3f..4cfcc7e 100644
> > --- 3.3-rc1.orig/arch/x86/include/asm/pgtable.h
> > +++ 3.3-rc1/arch/x86/include/asm/pgtable.h
> > @@ -165,6 +165,11 @@ static inline int has_transparent_hugepage(void)
> > {
> > return cpu_has_pse;
> > }
> > +
> > +static inline pte_t thp_ptep_get(pmd_t *pmd)
> > +{
> > + return *(pte_t *)pmd;
> > +}
>
> I'm sorry but I don't think the name is good.
> (But I know my sense of naming is bad ;)
I named it from huge_ptep_get() defined for hugetlbfs.
But by my rethinking, it's bad naming.
>
> How about pmd_to_pte_t ?
OK, it looks straightforward.
I'll take it if someone does not have better ideas.
> And, I wonder you can add error check as VM_BUG_ON(!pmd_trans_huge(*pmd));
Good, I'll add it.
Thank you, KAMEZAWA-san.
Naoya
next prev parent reply other threads:[~2012-01-30 19:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 23:02 [PATCH 0/6 v4] pagemap handles transparent hugepage Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 1/6] pagemap: avoid splitting thp when reading /proc/pid/pagemap Naoya Horiguchi
2012-01-29 13:17 ` Hillf Danton
2012-01-30 19:23 ` Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 2/6] thp: optimize away unnecessary page table locking Naoya Horiguchi
2012-01-28 11:23 ` Hillf Danton
2012-01-28 22:33 ` Naoya Horiguchi
2012-01-30 6:22 ` KAMEZAWA Hiroyuki
2012-02-02 5:27 ` Naoya Horiguchi
2012-02-02 8:32 ` KAMEZAWA Hiroyuki
2012-01-27 23:02 ` [PATCH 3/6] pagemap: export KPF_THP Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 4/6] pagemap: document KPF_THP and make page-types aware of it Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 5/6] introduce thp_ptep_get() Naoya Horiguchi
2012-01-30 6:26 ` KAMEZAWA Hiroyuki
2012-01-30 19:24 ` Naoya Horiguchi [this message]
2012-01-27 23:02 ` [PATCH 6/6] pagemap: introduce data structure for pagemap entry Naoya Horiguchi
2012-01-30 6:31 ` KAMEZAWA Hiroyuki
2012-01-30 19:27 ` Naoya Horiguchi
-- strict thread matches above, loose matches on Subject: below --
2012-01-12 19:34 [PATCH 0/6 v3] pagemap handles transparent hugepage Naoya Horiguchi
2012-01-12 19:34 ` [PATCH 5/6] introduce thp_ptep_get() Naoya Horiguchi
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