linux-kernel - Re: [PATCH] ring_buffer: NUMA aware page allocations

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Date:	Tue, 13 Jan 2009 02:29:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Robert Richter <robert.richter@....com>,
	Steven Rostedt <rostedt@...hat.com>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ring_buffer: NUMA aware page allocations


* Eric Dumazet <dada1@...mosbay.com> wrote:

> Hi Robert & Steven
> 
> While browsing oprofile code in current tree, I discovered 
> drivers/oprofile/cpu_buffer.c was using new ring_buffer code.
> 
> Apparently we lost in the conversion NUMA allocations, unless
> I am mistaken, since rb_allocate_pages() uses plain
> __get_free_page(GFP_KERNEL) calls to allocate pages.
> 
> All "buffer_page" structs are allocated with kzalloc_node(),
> but not the pages themselves.
> 
> Thank you
> 
> [PATCH] ring_buffer: NUMA aware page allocations
> 
> rb_allocate_pages() & ring_buffer_resize() should use alloc_pages_node()
> instead of __get_free_page() to allocate pages.

nice improvement!

	Ingo
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