<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi<div class=""><br class=""></div><div class="">I believe that this change may be the caused of <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1477254" class="">https://bugzilla.mozilla.org/show_bug.cgi?id=1477254</a></div><div class=""><br class=""></div><div class="">That is, the pref value set in all.js no longer overrides the default value set in StaticPrefs. The problem occurs mostly with e10s on, when e10s is disabled, I see the problem only about 5% of the time.</div><div class=""><br class=""></div><div class="">JY<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 13 Jul 2018, at 10:37 pm, Kris Maglione <<a href="mailto:kmaglione@mozilla.com" class="">kmaglione@mozilla.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">tl;dr: A major change to the architecture preference service has just landed, so please be on the lookout for regressions.<br class=""><br class="">We've been working for the last few weeks on rearchitecting the preference service to work better in our current and future multi-process configurations, and those changes have just landed in bug 1471025.<br class=""><br class="">Our preference database tends to be very large, even without any user values. It also needs to be available in every process. Until now, that's meant complete separate copies of the hash table, name strings, and value strings in each process, along with separate initialization in each content process, and a lot of IPC overhead to keep the databases in sync.<br class=""><br class="">After bug 1471025, the database is split into two sections: a snapshot of the initial state of the database, which is stored in a read-only shared memory region and shared by all processes, and a dynamic hash table of changes on top of that snapshot, of which each process has its own. This approach significantly decreases memory, IPC, and content process initialization overhead. It also decreases the complexity of certain cross-process synchronization logic.<br class=""><br class="">But it adds complexity in other areas, and represents one of the largest changes to the workings of the preference service since its creation. So please be on the lookout for regressions that look related to preference handling. If you spot any, please file bugs blocking <a href="https://bugzil.la/1471025" class="">https://bugzil.la/1471025</a>.<br class=""><br class="">Thanks,<br class="">Kris<br class="">_______________________________________________<br class="">firefox-dev mailing list<br class=""><a href="mailto:firefox-dev@mozilla.org" class="">firefox-dev@mozilla.org</a><br class="">https://mail.mozilla.org/listinfo/firefox-dev<br class=""></div></div></blockquote></div><br class=""></div></body></html>