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The DNS pre-resolution system already "learns" what domains are commonly
needed when rendering sub-resources of a page at a given domain.
This patch saves (some of) the information learned into a persistent
pref, and restores it on startup.
For now, I put in a wimpy pruning of the list each time I save, so that
the list will not grow endlessly from session to session. I probably need
a better pruning algorithm, such as one that prunes after a given amount
of time, rather than only during shutdown. For now, this should get
a lot of nice results, and provide slightly larger than needed lists to
users that have long lived sessions, which is similar to the current
performance, where I didn't persist any info, and only pruned (actually
discarded) all learned info at shutdown.
r=mbelshe
Review URL: http://codereview.chromium.org/21374
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9912 0039d316-1c4b-4281-b951-d872f2087c98
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Prevent a DCHECK from firing.
As we adaptively learn about referrers to enhance DNS
pre-resolution, we are forced to evict some entries
to prevent accidentally getting really large lists
(when we make mistakes). Sometimes we evict a
referred item from a list *while* that item is being
resolved (because it was in teh list). In that case,
we have to be careful when we try to acrue credit
(latency savings).
r=paulg
Review URL: http://codereview.chromium.org/18527
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8531 0039d316-1c4b-4281-b951-d872f2087c98
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Set initial values to 0.
TBR=jar
Review URL: http://codereview.chromium.org/12507
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6070 0039d316-1c4b-4281-b951-d872f2087c98
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from compiling on linux.
Patch by Kunal Thakar <kunalt@gmail.com>,
original CL: http://codereview.chromium.org/10773
Review URL: http://codereview.chromium.org/12674
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6034 0039d316-1c4b-4281-b951-d872f2087c98
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Use the HTTP "referer" header to identify subresources used during a
page load. Store that info, and use it when next visiting the referenced
hosts to pre-resolve the (probably) needed subresources.
This set of changes will surely evolve as we see how it plays out
on broader distribution (via histogram measurments), but this should be
the foundation of the change.
In design specs, this was previously referred to as "adaptive correlated
DNS prefetching."
r=mbelshe
Review URL: http://codereview.chromium.org/9168
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@4929 0039d316-1c4b-4281-b951-d872f2087c98
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