Fix for font files being mmaped multiple times (Fontconfig).
Before this change, when there were a lot of font fallbacks happening on
the web site, the fallback font was mmaped multiple times, reaching up to
200 times in the TC url: http://jsfiddle.net/p5pe81vs/, leading to OOMs
and crashes for renderer process.
This happens after the change introduced in
https://codereview.chromium.org/307243002
This CL keeps track of the mmaps for each font ID to avoid any further
unnecessary IPC requests and mmaps for future requests of the same font
ID that would result in new FD.
BUG=430021
NOPRESUBMIT=true
brettw indicates this use of ScopedAllowIO is acceptable.
Previous code eluded IO checks, this change makes the IO use find-able.
Review URL: https://codereview.chromium.org/697383002
Cr-Commit-Position: refs/heads/master@{#313102}
2 files changed
