linux-kernel - Re: [PATCH 0/7][v2] zram/xvmalloc: 64K page fixes and optimizations

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Date:	Sat, 29 Jan 2011 12:54:13 -0600
From:	Robert Jennings <rcj@...ux.vnet.ibm.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Nitin Gupta <ngupta@...are.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7][v2] zram/xvmalloc: 64K page fixes and optimizations

* Pekka Enberg (penberg@...helsinki.fi) wrote:
> On Fri, 2011-01-28 at 08:56 -0600, Robert Jennings wrote:
> > Based on feedback this is version 2 of my patches to fix zram and the
> > xvmalloc allocator for 64K page size kernels along with a few small
> > zram optimizations.
> > 
> > I have dropped the patch to mark the device as non-rotational media as
> > this was duplicated elsewhere.  I also dropped the patch regarding caching
> > the indices for page size allocations because gcc is quite smart.
> > 
> > There are two new patches at the end of this patch set.  The first
> > changes zram to return zero'd pages for reads of pages which have not
> > been written to, this eliminates passing uninitialized pages back
> > to user-space.  The second new patch cleans up freelist pointer
> > management and combines the two delete node functions into one common
> > function.
> > 
> > The xvmalloc allocator is non-functional when running with a 64K page
> > size.  The first two patches fix 64K page related issues.
> > [1/7] [v2] zram/vmalloc: Correct tunings to enable use with 64K pages
> > [2/7] [v2] zram: Prevent overflow in logical block size
> > 
> > The next 3 patches provide some small optimizations for zram and
> > xvmalloc.
> > [3/7] [v2] zram/xvmalloc: free bit block insertion optimization
> > [4/7] [v2] zram/xvmalloc: create CONFIG_ZRAM_DEBUG for debug code
> > [5/7] [v2] zram/xvmalloc: Close 32byte hole on 64bit CPUs
> > 
> > These last 2 patches are new, see the description above.
> > [6/7] zram: Return zero'd pages on new reads
> > [7/7] zram/xvmalloc: combine duplicate block delete code
> > 
> > Thanks for the helpful reviews.
> 
> Hey, you dropped Nitin's and my Reviewed-by tags! Please don't do that
> in the future.
> 
> 			Pekka
> 
Very sorry about that, it was not my intention to drop the Reviewed-by
tags on the unchanged patches.  Thank you for reviewing these patches.

--Robert Jennings
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