RE: [PATCH] mm: create a separate slab for page->ptl allocation

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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-arch@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: RE: [PATCH] mm: create a separate slab for page->ptl allocation
Date: Mon,  4 Nov 2013 12:42:59 +0200 (EET)	[thread overview]
Message-ID: <20131104104259.86AFEE0090@blue.fi.intel.com> (raw)
In-Reply-To: <1382442839-7458-1-git-send-email-kirill.shutemov@linux.intel.com>

Kirill A. Shutemov wrote:
> If DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC are enabled spinlock_t on x86_64
> is 72 bytes. For page->ptl they will be allocated from kmalloc-96 slab,
> so we loose 24 on each. An average system can easily allocate few tens
> thousands of page->ptl and overhead is significant.
> 
> Let's create a separate slab for page->ptl allocation to solve this.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

ping?

-- 
 Kirill A. Shutemov

WARNING: multiple messages have this Message-ID (diff)

From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-arch@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: RE: [PATCH] mm: create a separate slab for page->ptl allocation
Date: Mon,  4 Nov 2013 12:42:59 +0200 (EET)	[thread overview]
Message-ID: <20131104104259.86AFEE0090@blue.fi.intel.com> (raw)
In-Reply-To: <1382442839-7458-1-git-send-email-kirill.shutemov@linux.intel.com>

Kirill A. Shutemov wrote:
> If DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC are enabled spinlock_t on x86_64
> is 72 bytes. For page->ptl they will be allocated from kmalloc-96 slab,
> so we loose 24 on each. An average system can easily allocate few tens
> thousands of page->ptl and overhead is significant.
> 
> Let's create a separate slab for page->ptl allocation to solve this.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

ping?

-- 
 Kirill A. Shutemov

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next prev parent reply	other threads:[~2013-11-04 10:42 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-22 11:53 [PATCH] mm: create a separate slab for page->ptl allocation Kirill A. Shutemov
2013-10-22 11:53 ` Kirill A. Shutemov
2013-10-22 12:55 ` Fengguang Wu
2013-10-22 12:55   ` Fengguang Wu
2013-11-04 10:42 ` Kirill A. Shutemov [this message]
2013-11-04 10:42   ` Kirill A. Shutemov
2013-11-05 23:01 ` Andrew Morton
2013-11-05 23:01   ` Andrew Morton
2013-11-05 22:42   ` Kirill A. Shutemov
2013-11-05 22:42     ` Kirill A. Shutemov
2013-11-05 23:56     ` Andrew Morton
2013-11-05 23:56       ` Andrew Morton
2013-11-05 23:13       ` Kirill A. Shutemov
2013-11-05 23:13         ` Kirill A. Shutemov
2013-11-06  0:43         ` Andrew Morton
2013-11-06  0:43           ` Andrew Morton
2013-11-06  9:31         ` Peter Zijlstra
2013-11-06  9:31           ` Peter Zijlstra
2013-11-06 11:18           ` Peter Zijlstra
2013-11-06 11:18             ` Peter Zijlstra
2013-11-06 13:31             ` lockref: Use bloated_spinlocks to avoid explicit config dependencies Kirill A. Shutemov
2013-11-06 13:31               ` Kirill A. Shutemov
2013-11-06 14:32               ` Peter Zijlstra
2013-11-06 14:32                 ` Peter Zijlstra
2013-11-06 13:21           ` [PATCH] mm: create a separate slab for page->ptl allocation Kirill A. Shutemov
2013-11-06 13:21             ` Kirill A. Shutemov
2013-11-06 14:30             ` Peter Zijlstra
2013-11-06 14:30               ` Peter Zijlstra
2013-11-06 10:34         ` Will Deacon
2013-11-06 10:34           ` Will Deacon
2013-11-06 10:49           ` Geert Uytterhoeven
2013-11-06 10:49             ` Geert Uytterhoeven
2013-11-06 11:02           ` Peter Zijlstra
2013-11-06 11:02             ` Peter Zijlstra

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