Here's a stupid little git-grep suggestion.
I recently transitioned from the use of egrep to git-grep, and i like it very much (it nicely excludes build related files, etc.), but there's one small detail: the lack of the -w flag.
It's equivalent to this pattern:
git grep '\<tick_length\>'
And it's the most common grep flag i (and i suspect many others) use, in addition to the (already supported) -l flag.
When grepping for symbols in a large repository (such as the Linux kernel) -w is very common and very useful - there's many similar symbols, variants of each other. I use it when seeing a symbol in an oops, etc.
While i realize that git-grep does not want to be a full grep replacement, there's a real usability difference between having to type:
git grep '\<schedule\>' git grep -w schedule
(especially since backslash is a seldom used key during a normal workflow, so accessing it is often a small mental hickup.)
Ingo