Re: [PATCH/RFC 2/2] Make path-limiting be incremental when possible.

Linus Torvalds [off-list ref] writes:

This is an absolutely huge deal for anything like "git log -- <pathname>", 
but also for some things that we don't do yet - like the "find where 
things changed" logic I've described elsewhere, where we want to find the 
previous revision that changed a file.
...
Btw, don't even bother testing this with the git archive. git itself is so 
small that parsing the whole revision history for it takes about a second 
even with path limiting.

By the way, I forgot to praise you ;-).  

Even on a fast machine, the old one was not very useful, but
this one is _instantaneous_.  Very good job.

$ PAGER=cat GIT_DIR=/pub/scm/linux/kernel/git/torvalds/linux-2.6.git/ \
  /usr/bin/time git log -1 --pretty=short -- drivers/
commit ce362c009250340358a7221f3cdb7954cbf19c01
Merge: 064c94f... cd7a920...
Author: Linus Torvalds [off-list ref]

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6

15.44user 0.19system 0:25.11elapsed 62%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+18050minor)pagefaults 0swaps

$ PAGER=cat GIT_DIR=/pub/scm/linux/kernel/git/torvalds/linux-2.6.git/ \
  /usr/bin/time ./git.pu log -1 --pretty=short -- drivers/
commit ce362c009250340358a7221f3cdb7954cbf19c01
Merge: 064c94f... cd7a920...
Author: Linus Torvalds [off-list ref]

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6

0.00user 0.00system 0:00.00elapsed 50%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+388minor)pagefaults 0swaps