From: Vlastimil Babka <vbabka@suse.cz>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>,
David Rientjes <rientjes@google.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv5 4/7] mm: pack compound_dtor and compound_order into one word in struct page
Date: Thu, 10 Sep 2015 11:41:56 +0200 [thread overview]
Message-ID: <55F15064.9040507@suse.cz> (raw)
In-Reply-To: <1441283758-92774-5-git-send-email-kirill.shutemov@linux.intel.com>
On 09/03/2015 02:35 PM, Kirill A. Shutemov wrote:
> The patch halves space occupied by compound_dtor and compound_order in
> struct page.
>
> For compound_order, it's trivial long -> short conversion.
>
> For get_compound_page_dtor(), we now use hardcoded table for destructor
> lookup and store its index in the struct page instead of direct pointer
> to destructor. It shouldn't be a big trouble to maintain the table: we
> have only two destructor and NULL currently.
>
> This patch free up one word in tail pages for reuse. This is preparation
> for the next patch.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Reviewed-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
WARNING: multiple messages have this Message-ID (diff)
From: Vlastimil Babka <vbabka@suse.cz>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>,
David Rientjes <rientjes@google.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv5 4/7] mm: pack compound_dtor and compound_order into one word in struct page
Date: Thu, 10 Sep 2015 11:41:56 +0200 [thread overview]
Message-ID: <55F15064.9040507@suse.cz> (raw)
In-Reply-To: <1441283758-92774-5-git-send-email-kirill.shutemov@linux.intel.com>
On 09/03/2015 02:35 PM, Kirill A. Shutemov wrote:
> The patch halves space occupied by compound_dtor and compound_order in
> struct page.
>
> For compound_order, it's trivial long -> short conversion.
>
> For get_compound_page_dtor(), we now use hardcoded table for destructor
> lookup and store its index in the struct page instead of direct pointer
> to destructor. It shouldn't be a big trouble to maintain the table: we
> have only two destructor and NULL currently.
>
> This patch free up one word in tail pages for reuse. This is preparation
> for the next patch.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Reviewed-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
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next prev parent reply other threads:[~2015-09-10 9:42 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-03 12:35 [PATCHv5 0/7] Fix compound_head() race Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-03 12:35 ` [PATCHv5 1/7] mm: drop page->slab_page Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-07 5:00 ` Alexander Duyck
2015-09-07 5:00 ` Alexander Duyck
2015-09-07 12:19 ` Kirill A. Shutemov
2015-09-07 12:19 ` Kirill A. Shutemov
2015-09-03 12:35 ` [PATCHv5 2/7] slub: use page->rcu_head instead of page->lru plus cast Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-03 12:35 ` [PATCHv5 3/7] zsmalloc: use page->private instead of page->first_page Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-03 12:35 ` [PATCHv5 4/7] mm: pack compound_dtor and compound_order into one word in struct page Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-10 9:41 ` Vlastimil Babka [this message]
2015-09-10 9:41 ` Vlastimil Babka
2015-09-03 12:35 ` [PATCHv5 5/7] mm: make compound_head() robust Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-10 10:54 ` Vlastimil Babka
2015-09-10 10:54 ` Vlastimil Babka
2015-09-11 13:35 ` Kirill A. Shutemov
2015-09-11 13:35 ` Kirill A. Shutemov
2015-09-14 13:31 ` Vlastimil Babka
2015-09-14 13:31 ` Vlastimil Babka
2015-09-03 12:35 ` [PATCHv5 6/7] mm: use 'unsigned int' for page order Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-10 11:04 ` Vlastimil Babka
2015-09-10 11:04 ` Vlastimil Babka
2015-09-03 12:35 ` [PATCHv5 7/7] mm: use 'unsigned int' for compound_dtor/compound_order on 64BIT Kirill A. Shutemov
2015-09-03 12:35 ` Kirill A. Shutemov
2015-09-10 11:34 ` Vlastimil Babka
2015-09-10 11:34 ` Vlastimil Babka
2015-09-04 13:43 ` [PATCHv5 0/7] Fix compound_head() race Andrea Arcangeli
2015-09-04 13:43 ` Andrea Arcangeli
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