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From: John Baldwin <jhb@freebsd.org>
To: Gleb Smirnoff <glebius@freebsd.org>
Subject: Re: svn commit: r249265 - in head/sys: amd64/include arm/include
 i386/include ia64/include mips/include powerpc/include sparc64/include sys
Date: Mon, 8 Apr 2013 15:41:27 -0400
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On Monday, April 08, 2013 3:19:10 pm Gleb Smirnoff wrote:
> Author: glebius
> Date: Mon Apr  8 19:19:10 2013
> New Revision: 249265
> URL: http://svnweb.freebsd.org/changeset/base/249265
> 
> Log:
>   Merge from projects/counters:
>   
>     Pad struct pcpu so that its size is denominator of PAGE_SIZE. This
>   is done to reduce memory waste in UMA_PCPU_ZONE zones.
>   
>   Sponsored by:	Nginx, Inc.
> 
> Modified: head/sys/sys/pcpu.h
> 
==============================================================================
> --- head/sys/sys/pcpu.h	Mon Apr  8 19:10:45 2013	(r249264)
> +++ head/sys/sys/pcpu.h	Mon Apr  8 19:19:10 2013	(r249265)
> @@ -180,6 +180,14 @@ struct pcpu {
>  	PCPU_MD_FIELDS;
>  } __aligned(CACHE_LINE_SIZE);

Why not change this to be PAGE_SIZE rather than putting explicit padding in 
all the pcpu fields?  That would seem to be more maintainable.

-- 
John Baldwin