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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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test-inotify-issue1542.out
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/ tests / test-inotify-issue1542.out
Nicolas Dumazet
Fixing issue1542, adding a relevant test...
r7892 % inserve
A dir/c
? a
? dir/b
? hg.pid
% moving dir out
% status
! dir/c
? a
? hg.pid
Are we able to kill the service? if not, the service died on some error