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bug#24126: vc-hg-state can be extremely slow

From: Dmitry Gutov
Subject: bug#24126: vc-hg-state can be extremely slow
Date: Tue, 2 Aug 2016 19:19:30 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:47.0) Gecko/20100101 Thunderbird/47.0 
On 08/02/2016 06:57 PM, Jonathan Kotta wrote:


In the case of `vc-root-diff` at least, it's passing in a directory; the
command is essentially `hg status -A ./`, and the CWD is indeed the repo
root.  I did this by running `vc-root-diff` from a dired buffer visiting
the repo root.


OK, thanks. The chain of calls looks like this:

  vc-hg-state("~/vc/mozilla-central/")
  vc-hg-registered("~/vc/mozilla-central/")
  apply(vc-hg-registered "~/vc/mozilla-central/")
  vc-call-backend(Hg registered "~/vc/mozilla-central/")
  vc-registered("~/vc/mozilla-central/")
  vc-backend("~/vc/mozilla-central/")
  vc-working-revision("~/vc/mozilla-central/")
  vc-root-diff(nil t)
Maybe vc-hg-registered shouldn't delegate to vc-hg-state, and call 'hg status' on its own without '-A'.
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