From: "Ken Chen" <kenchen@google.com>
To: Dave Hansen <haveblue@us.ibm.com>
Cc: Adam Litke <agl@us.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] hugetlb: Fix pool resizing corner case
Date: Wed, 3 Oct 2007 12:08:52 -0700 [thread overview]
Message-ID: <b040c32a0710031208s5323d16ao47becace88c2bc79@mail.gmail.com> (raw)
In-Reply-To: <1191437948.4939.105.camel@localhost>
On 10/3/07, Dave Hansen <haveblue@us.ibm.com> wrote:
> > Not quite. Count can never go below the number of reserved pages plus
> > pages allocated to MAP_PRIVATE mappings. That number is computed by:
> > (resv + (total - free)).
>
> So, (total - free) equals the number of MAP_PRIVATE pages? Does that
> imply that all reserved pages are shared and that all shared pages are
> reserved?
no, not quite. In-use huge page (total - free) can be both private or
shared. resv_huge_pages counts number of pages that is committed for
shared mapping, but not yet faulted in.
What the equation does essentially is: resv_huge_pages + nr-huge-pages-in-use.
- Ken
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next prev parent reply other threads:[~2007-10-03 19:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-03 15:47 Adam Litke
2007-10-03 17:40 ` Dave Hansen
2007-10-03 18:33 ` Adam Litke
2007-10-03 18:59 ` Dave Hansen
2007-10-03 19:08 ` Ken Chen [this message]
2007-10-03 19:03 ` Ken Chen
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