From: j.neuschaefer@gmx.net (Jonathan Neuschäfer)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Can i allocate 4GB virtual addresses (more than a certain limit) using vmalloc?
Date: Tue, 23 Aug 2011 00:27:38 +0200 [thread overview]
Message-ID: <20110822222738.GA29752@debian.debian> (raw)
In-Reply-To: <CAKRO8zJQXOdH=mgMfZmCgNvxJnRqnGo_vT-xArGSTx0yX01TLg@mail.gmail.com>
On Mon, Aug 22, 2011 at 04:43:55PM -0500, subin gangadharan wrote:
> Hi Dave,
>
> >Also keep in mind that when you vmalloc stuff you're allocating in
> >units of pages, and there is a guard page between each allocation. So
> >if you had 512 Mb of virtual space (which is 131,072 pages), you'll be
> >able to vmalloc a maximum of 65536 objects or 1 page each. Fewer
> >objects if they're bigger than a page.
>
> A quick question, Suppose if I alloc 1MB of memory using vmalloc,Is there a
> guard page between each page or is it after the 1MB.
If you do it one vmalloc call your 1MiB should be continuous, i.e. if
there's a guard page it will be after your megabyte.
HTH,
Jonathan Neusch?fer
next prev parent reply other threads:[~2011-08-22 22:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-31 5:54 Can i allocate 4GB virtual addresses (more than a certain limit) using vmalloc? sandeep kumar
2011-05-31 7:02 ` Mulyadi Santosa
2011-05-31 8:09 ` sandeep kumar
2011-05-31 15:19 ` Dave Hylands
2011-08-22 21:43 ` subin gangadharan
2011-08-22 22:27 ` Jonathan Neuschäfer [this message]
2011-05-31 15:27 ` Peter Teoh
2011-06-01 4:24 ` sandeep kumar
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