195186 2019-02-28 14:39:43 -0800 JSScript should keep the cache file locked for the duration of its existence and should truncate the cache when it is out of date 2019-03-06 19:07:34 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 saam saam benjamin commit-queue fpizlo ggaren gskachkov guijemont keith_miller mark.lam msaboff rmorisset ticaiolima tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1511128 0 saam 2019-02-28 14:39:43 -0800 ... 1511329 1 tzagallo 2019-02-28 23:57:45 -0800 I don't think we need to keep the file locked after we mmap'd it. Since we are using MAP_PRIVATE, we won't see the updates until the next time we mmap it. 1511336 2 saam 2019-03-01 00:39:50 -0800 I don’t think that’s how mmap works. I think it’s probably unspecified, but if I had to guess, if we mmap it in, then someone else changes content on disk, and then we page fault in that new content on a read, we’ll see the updated content. But there’s a more interesting reason we want to keep it locked: we want to update the API to iteratively update the cache 1511338 3 saam 2019-03-01 00:42:20 -0800 One man page agrees with me: “MAP_SHARED and MAP_PRIVATE describe the disposition of write references to the memory object. If MAP_SHARED is specified, write references change the underlying object. If MAP_PRIVATE is specified, modifications to the mapped data by the calling process will be visible only to the calling process and will not change the underlying object. It is unspecified whether modifications to the underlying object done after the MAP_PRIVATE mapping is established are visible through the MAP_PRIVATE mapping. Either MAP_SHARED or MAP_PRIVATE can be specified, but not both. The mapping type is retained across fork().” https://pubs.opengroup.org/onlinepubs/7908799/xsh/mmap.html 1511340 4 tzagallo 2019-03-01 00:47:03 -0800 Yes, you're right, I came across the same thing and was about to comment too. Either way, I don't think we should keep the file locked for updates, since that would require an exclusive lock on the file, so only one process would be able to use the cache at a time. I think we should keep the shared lock during the script execution and only acquire the exclusive lock when we want to write to the cache. 1512356 5 saam 2019-03-04 14:02:40 -0800 (In reply to Tadeu Zagallo from comment #4) > Yes, you're right, I came across the same thing and was about to comment too. > > Either way, I don't think we should keep the file locked for updates, since > that would require an exclusive lock on the file, so only one process would > be able to use the cache at a time. I think we should keep the shared lock > during the script execution and only acquire the exclusive lock when we want > to write to the cache. I think it makes more sense to make the cache file locked to a single VM at a time. It just simplifies thinking about two VMs concurrently iteratively updating it. That use will not be something we need to support. We could relax this in the future, but I think we should start with the more constrained semantics and only open it up once we're sure we can support such use cases. 1512401 6 363564 saam 2019-03-04 16:09:39 -0800 Created attachment 363564 patch 1512669 7 363564 tzagallo 2019-03-05 09:39:02 -0800 Comment on attachment 363564 patch View in context: https://bugs.webkit.org/attachment.cgi?id=363564&action=review Nice, I agree this makes sense for now. > Source/JavaScriptCore/API/JSScript.mm:190 > + int fd = open([m_cachePath path].UTF8String, O_CREAT | O_RDWR, 0666); Not this diff, but you can combine the locking with open by doing open([m_cachePath path].UTF8String, O_CREAT | O_RDWR | O_EXLOCK | O_NONBLOCK, 0666) I did it somewhere else, but forgot it here. 1512719 8 363564 saam 2019-03-05 11:22:10 -0800 Comment on attachment 363564 patch View in context: https://bugs.webkit.org/attachment.cgi?id=363564&action=review >> Source/JavaScriptCore/API/JSScript.mm:190 >> + int fd = open([m_cachePath path].UTF8String, O_CREAT | O_RDWR, 0666); > > Not this diff, but you can combine the locking with open by doing > > open([m_cachePath path].UTF8String, O_CREAT | O_RDWR | O_EXLOCK | O_NONBLOCK, 0666) > > I did it somewhere else, but forgot it here. Nice. I'll fix. 1513226 9 363564 keith_miller 2019-03-06 15:15:48 -0800 Comment on attachment 363564 patch View in context: https://bugs.webkit.org/attachment.cgi?id=363564&action=review r=me. > Source/JavaScriptCore/API/JSScript.mm:54 > - UniquedStringImpl* m_moduleKey; > + int m_cacheFileDescriptor; Can you use C++ initializers here? e.g. { -1 } 1513299 10 363564 saam 2019-03-06 16:59:20 -0800 Comment on attachment 363564 patch View in context: https://bugs.webkit.org/attachment.cgi?id=363564&action=review >> Source/JavaScriptCore/API/JSScript.mm:54 >> + int m_cacheFileDescriptor; > > Can you use C++ initializers here? e.g. { -1 } Doesn't seem like we can. This is a compile error. 1513307 11 363821 saam 2019-03-06 17:04:29 -0800 Created attachment 363821 patch for landing 1513330 12 363821 commit-queue 2019-03-06 18:03:45 -0800 Comment on attachment 363821 patch for landing Clearing flags on attachment: 363821 Committed r242585: <https://trac.webkit.org/changeset/242585> 1513331 13 commit-queue 2019-03-06 18:03:47 -0800 All reviewed patches have been landed. Closing bug. 1513345 14 webkit-bug-importer 2019-03-06 19:07:34 -0800 <rdar://problem/48662679> 363564 2019-03-04 16:09:39 -0800 2019-03-06 17:04:29 -0800 patch a-backup.diff text/plain 11417 saam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjQyMzk5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDM5IEBA CisyMDE5LTAzLTA0ICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUuY29tPgorCisgICAgICAg IEpTU2NyaXB0IHNob3VsZCBrZWVwIHRoZSBjYWNoZSBmaWxlIGxvY2tlZCBmb3IgdGhlIGR1cmF0 aW9uIG9mIGl0cyBleGlzdGVuY2UgYW5kIHNob3VsZCB0cnVuY2F0ZSB0aGUgY2FjaGUgd2hlbiBp dCBpcyBvdXQgb2YgZGF0ZQorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 Zy5jZ2k/aWQ9MTk1MTg2CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisK KyAgICAgICAgVGhpcyBwYXRjaCBtYWtlcyBpdCBzbyB0aGF0IEpTU2NyaXB0IHdpbGwga2VlcCBp 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