From: Michal Hocko <mhocko@suse.cz>
To: Will Deacon <will.deacon@arm.com>
Cc: Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hillf Danton <dhillf@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace
Date: Thu, 16 Aug 2012 19:25:27 +0200 [thread overview]
Message-ID: <20120816172527.GA12578@dhcp22.suse.cz> (raw)
In-Reply-To: <20120816160954.GA4330@mudshark.cambridge.arm.com>
On Thu 16-08-12 17:09:54, Will Deacon wrote:
> On Wed, Aug 08, 2012 at 05:26:07PM +0100, Michal Hocko wrote:
> > I guess the cleanest way is to hook into dequeue_huge_page_node and add
> > something like arch_clear_hugepage_flags.
>
> I hooked into enqueue_huge_page instead, but how about something like this?:
Do you have any specific reason for that? enqueue_huge_page is called on
pages which potentially never get used so isn't that wasting a bit?
Not that it would be wrong I was just thinking why shouldn't we do it
when the page is actualy going to be used for sure.
--
Michal Hocko
SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@suse.cz>
To: Will Deacon <will.deacon@arm.com>
Cc: Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hillf Danton <dhillf@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace
Date: Thu, 16 Aug 2012 19:25:27 +0200 [thread overview]
Message-ID: <20120816172527.GA12578@dhcp22.suse.cz> (raw)
In-Reply-To: <20120816160954.GA4330@mudshark.cambridge.arm.com>
On Thu 16-08-12 17:09:54, Will Deacon wrote:
> On Wed, Aug 08, 2012 at 05:26:07PM +0100, Michal Hocko wrote:
> > I guess the cleanest way is to hook into dequeue_huge_page_node and add
> > something like arch_clear_hugepage_flags.
>
> I hooked into enqueue_huge_page instead, but how about something like this?:
Do you have any specific reason for that? enqueue_huge_page is called on
pages which potentially never get used so isn't that wasting a bit?
Not that it would be wrong I was just thinking why shouldn't we do it
when the page is actualy going to be used for sure.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2012-08-16 17:25 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-04 14:32 [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace Will Deacon
2012-07-04 14:32 ` Will Deacon
2012-07-05 12:37 ` Hillf Danton
2012-07-05 12:37 ` Hillf Danton
2012-07-05 14:17 ` Will Deacon
2012-07-05 14:17 ` Will Deacon
2012-07-06 13:15 ` Hillf Danton
2012-07-06 13:15 ` Hillf Danton
2012-07-09 12:25 ` Michal Hocko
2012-07-09 12:25 ` Michal Hocko
2012-07-09 14:13 ` Will Deacon
2012-07-09 14:13 ` Will Deacon
2012-07-09 23:57 ` Hugh Dickins
2012-07-09 23:57 ` Hugh Dickins
2012-07-10 9:45 ` Will Deacon
2012-07-10 9:45 ` Will Deacon
2012-07-10 10:42 ` Will Deacon
2012-07-10 10:42 ` Will Deacon
2012-07-11 17:48 ` Will Deacon
2012-07-11 17:48 ` Will Deacon
2012-07-12 11:16 ` Michal Hocko
2012-07-12 11:16 ` Michal Hocko
2012-07-12 11:26 ` James Bottomley
2012-07-12 11:26 ` James Bottomley
2012-07-12 11:26 ` Will Deacon
2012-07-12 11:26 ` Will Deacon
2012-07-12 11:57 ` Michal Hocko
2012-07-12 11:57 ` Michal Hocko
2012-08-07 16:03 ` Will Deacon
2012-08-07 16:03 ` Will Deacon
2012-08-08 16:26 ` Michal Hocko
2012-08-08 16:26 ` Michal Hocko
2012-08-16 16:09 ` Will Deacon
2012-08-16 16:09 ` Will Deacon
2012-08-16 16:09 ` Will Deacon
2012-08-16 16:09 ` Will Deacon
2012-08-16 17:25 ` Michal Hocko [this message]
2012-08-16 17:25 ` Michal Hocko
2012-08-16 17:34 ` Will Deacon
2012-08-16 17:34 ` Will Deacon
2012-08-16 18:06 ` Michal Hocko
2012-08-16 18:06 ` Michal Hocko
2012-08-16 18:19 ` Will Deacon
2012-08-16 18:19 ` Will Deacon
2012-08-16 18:20 ` Michal Hocko
2012-08-16 18:20 ` Michal Hocko
2012-08-16 18:32 ` Will Deacon
2012-08-16 18:32 ` Will Deacon
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