linux-kernel - Re: [-mm PATCH] Memory controller improve user interface (v3)

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Date:	Tue, 04 Sep 2007 12:03:13 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.osdl.org>,
	Paul Menage <menage@...gle.com>,
	Linux MM Mailing List <linux-mm@...ck.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [-mm PATCH]  Memory controller improve user interface (v3)

On Sun, 2007-09-02 at 16:20 +0530, Balbir Singh wrote:
> 
> +Setting a limit to a number that is not a multiple of page size causes
> +rounding up of the value. The user must check back to see (by reading
> +memory.limit_in_bytes), to check for differences between desired values and
> +committed values. Currently, all accounting is done in multiples of PAGE_SIZE 

I wonder if we can say this in a bit more generic fashion.

        A successful write to this file does not guarantee a successful
        set of this limit to the value written into the file.  This can
        be due to a number of factors, such as rounding up to page
        boundaries or the total availability of memory on the system.
        The user is required to re-read this file after a write to
        guarantee the value committed by the kernel.

This keeps a user from saying "I page aligned the value I stuck in
there, no I don't have to check it."

-- Dave

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