"Stephen C. Tweedie" <[EMAIL PROTECTED]> writes:
> On Wed, Jan 24, 2001 at 12:35:12AM +, David Wragg wrote:
> >
> > > And why do the pages need to be kmapped?
> >
> > They only need to be kmapped while data is being copied into them.
>
> But you only need to kmap one page at a time during
Hi,
On Wed, Jan 24, 2001 at 12:35:12AM +, David Wragg wrote:
>
> > And why do the pages need to be kmapped?
>
> They only need to be kmapped while data is being copied into them.
But you only need to kmap one page at a time during the copy. There
is absolutely no need to copy the whole c
David Wragg <[EMAIL PROTECTED]> writes:
> I'd still like to know what the basis for the current kmap limit
> setting is.
Mostly at one point kmap_atomic was all there was. It was only the
difficulty of implementing copy_from_user with kmap_atomic that convinced
people we needed something more.
"Benjamin C.R. LaHaise" <[EMAIL PROTECTED]> writes:
> On 24 Jan 2001, David Wragg wrote:
>
> > [EMAIL PROTECTED] (Eric W. Biederman) writes:
> > > Why do you need such a large buffer?
> >
> > ext2 doesn't guarantee sustained write bandwidth (in particular,
> > writing a page to an ext2 file can
On 24 Jan 2001, David Wragg wrote:
> [EMAIL PROTECTED] (Eric W. Biederman) writes:
> > Why do you need such a large buffer?
>
> ext2 doesn't guarantee sustained write bandwidth (in particular,
> writing a page to an ext2 file can have a high latency due to reading
> the block bitmap synchronous
[EMAIL PROTECTED] (Eric W. Biederman) writes:
> Why do you need such a large buffer?
ext2 doesn't guarantee sustained write bandwidth (in particular,
writing a page to an ext2 file can have a high latency due to reading
the block bitmap synchronously). To deal with this I need at least a
2MB bu
David Wragg <[EMAIL PROTECTED]> writes:
> While testing some kernel code of mine on a machine with
> CONFIG_HIGHMEM enabled, I've run into the limit on the number of pages
> that can be kmapped at once. I was surprised to find it was so low --
> only 2MB/4MB of address space for kmap (according
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