200444 2019-08-05 13:14:51 -0700 High number of cache miss on localTimeOffset 2019-08-07 06:15:58 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ticaiolima ticaiolima commit-queue darin ews-watchlist ggaren keith_miller mark.lam msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1558517 0 ticaiolima 2019-08-05 13:14:51 -0700 There are cases with a high number of cache miss on `localTimeOffset` while using "https://www.messenger.com". From profiling information collected during usage of ~10 minutes, there were ~3520 cache miss and 54 cache hit. The profiling was collected during conversation in 2 chats. 1558521 1 ticaiolima 2019-08-05 13:30:52 -0700 Also the problem happens when applications call `gregorianDateTimeToMS` and `msToGregorianDateTime` intercalated and `inputTimeType == WTF::LocalTime` in both functions. The issue happens because `msToGregorianDateTime` calls `localTimeOffset` with `WTF::UTCTime` and force a cache reset. 1558525 2 375548 ticaiolima 2019-08-05 13:33:42 -0700 Created attachment 375548 WIP - Patch 1558788 3 375625 ticaiolima 2019-08-06 09:20:21 -0700 Created attachment 375625 Patch 1558840 4 ggaren 2019-08-06 11:16:13 -0700 ** The following JSC stress test failures have been introduced: mozilla-tests.yaml/js1_5/Array/regress-101964.js.mozilla 1558842 5 375625 ggaren 2019-08-06 11:23:06 -0700 Comment on attachment 375625 Patch Patch looks correct -- can you run the JSC tests locally and see if you reproduce that failure? Also, it would be nice, in a follow-up, to remove callers that use WTF::LocalTime. The input to this function is supposed to be UTC time exclusively. 1558886 6 ticaiolima 2019-08-06 12:56:30 -0700 Thx a lot for the review! (In reply to Geoffrey Garen from comment #4) > ** The following JSC stress test failures have been introduced: > mozilla-tests.yaml/js1_5/Array/regress-101964.js.mozilla Since last month, this test is failing sometimes. It fails more often on MIPS bots, but I saw it failing on jsc EWS in a couple of patches I've sent last week. We tried to reproduce the fail locally using our MIPS bots, but it seems to happen only when running stress tests and in a very specific case we didn't identify yet. I personally couldn't reproduce it on macOS so far. Anyway, I'm running tests locally before commiting it. 1559094 7 375625 ticaiolima 2019-08-07 05:11:43 -0700 Comment on attachment 375625 Patch Failure doesn't see related. I ran Debug and Relase mode locally and got no error. 1559098 8 375625 commit-queue 2019-08-07 05:41:07 -0700 Comment on attachment 375625 Patch Clearing flags on attachment: 375625 Committed r248363: <https://trac.webkit.org/changeset/248363> 1559099 9 commit-queue 2019-08-07 05:41:08 -0700 All reviewed patches have been landed. Closing bug. 1559100 10 webkit-bug-importer 2019-08-07 05:42:15 -0700 <rdar://problem/54029582> 1559101 11 ticaiolima 2019-08-07 06:15:58 -0700 (In reply to Geoffrey Garen from comment #5) > Comment on attachment 375625 [details] > Patch > > Patch looks correct -- can you run the JSC tests locally and see if you > reproduce that failure? > > Also, it would be nice, in a follow-up, to remove callers that use > WTF::LocalTime. The input to this function is supposed to be UTC time > exclusively. Just for the record, this is the bug where `WTF::TimeType` was introduced. https://bugs.webkit.org/show_bug.cgi?id=130967 375548 2019-08-05 13:33:42 -0700 2019-08-06 09:20:15 -0700 WIP - Patch local_time_offset_utc_cache.diff text/plain 3258 ticaiolima ZGlmZiAtLWdpdCBhL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9ydW50aW1lL0pTRGF0ZU1hdGguY3Bw IGIvU291cmNlL0phdmFTY3JpcHRDb3JlL3J1bnRpbWUvSlNEYXRlTWF0aC5jcHAKaW5kZXggMDcx NWQ0ZTFlZDYuLjEwNzNhZjAyN2NjIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENvcmUv cnVudGltZS9KU0RhdGVNYXRoLmNwcAorKysgYi9Tb3VyY2UvSmF2YVNjcmlwdENvcmUvcnVudGlt ZS9KU0RhdGVNYXRoLmNwcApAQCAtMTMxLDE0ICsxMzEsMTYgQEAgc3RhdGljIGlubGluZSBpbnQg bXNUb1dlZWtEYXkoZG91YmxlIG1zKQogLy8gSWYgdGhpcyBmdW5jdGlvbiBpcyBjYWxsZWQgd2l0 aCBOYU4gaXQgcmV0dXJucyBOYU4uCiBzdGF0aWMgTG9jYWxUaW1lT2Zmc2V0IGxvY2FsVGltZU9m ZnNldChWTSYgdm0sIGRvdWJsZSBtcywgV1RGOjpUaW1lVHlwZSBpbnB1dFRpbWVUeXBlID0gV1RG OjpVVENUaW1lKQogewotICAgIExvY2FsVGltZU9mZnNldENhY2hlJiBjYWNoZSA9IHZtLmxvY2Fs 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