[webkit-dev] Discussing bug 98539 - Refactor resource loading to allow for out-of-process loading and memory caching

[Jochen Eisinger]

Hey,

can you share your plan how to prioritize network requests in the network
process?

It's a long standing issue of the chromium port (and I believe the
blackberry port is affected as well) that a ResourceRequest doesn't know
whether it was created for e.g. an XHR or a main document load, which makes
it difficult to prioritize the requests.

We currently work around that issue by adding a TargetType to
ResourceRequest which is however a layering violation which I'd like to get
rid of.

best
-jochen

On Mon, Oct 8, 2012 at 7:39 PM, Brady Eidson <beidson at apple.com> wrote:

> A bit of background:
>
> A few of us have been working on enhancing WebKit2's support for multiple
> WebProcesses.  As part of this effort I'm working on
> https://bugs.webkit.org/show_bug.cgi?id=98537 - "Add a NetworkProcess to
> WebKit2"
>
> One benefit of the NetworkProcess will be to have a single shared process
> doing network i/o on behalf of all attached WebProcesses.
>
> Another benefit we've identified is the ability to have that process also
> act as custodian for a shared memory cache amongst the attached
> WebProcesses.
>
> While this effort is primarily about WebKit 2, making it possible will
> obviously involve some changes to the WebCore memory cache and resource
> loading.
>
> I don't plan to shoehorn in changes, but rather to make sensical
> refactoring that cleans up the code for all ports.  Anyone familiar with
> the CachedResource and ResourceLoader mechanisms probably know they're not
> really up to the clarity and quality standards we strive for, and I'm
> excited about being able to focus on them for awhile and make them better
> for everyone.
>
> I have a few patches lined up locally to do this and have attached the
> first of these to https://bugs.webkit.org/show_bug.cgi?id=98539
>
> Feel free to share concerns here or in the collection of bugzillas that
> will slowly be growing as I make progress.
>
> ~Brady
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