diff options
| -rw-r--r-- | pkg/vcs/git.go | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/pkg/vcs/git.go b/pkg/vcs/git.go index dd9981873..f1311e312 100644 --- a/pkg/vcs/git.go +++ b/pkg/vcs/git.go @@ -764,10 +764,12 @@ type BaseCommit struct { Branches []string } -// BaseForDiff returns a list of commits that could have been the base commit -// for the specified git patch. -// The returned list is minimized to only contain the commits that are represented in different -// subsets of branches. +// BaseForDiff returns a list of commits that could have been the base +// commit for the specified git patch. +// For the purposes of optimization, the function only considers the +// commits that are newer than one year. +// The returned list is minimized to only contain the commits that are +// represented in different subsets of branches. func (git Git) BaseForDiff(diff []byte, tracer debugtracer.DebugTracer) ([]*BaseCommit, error) { // We can't just query git log with --find-object=HASH because that will only return // the revisions where the hashed content was introduced or removed, while what we actually @@ -784,6 +786,11 @@ func (git Git) BaseForDiff(diff []byte, tracer debugtracer.DebugTracer) ([]*Base "--no-renames", "-m", "-n", "500", + // With -m and -n 500, de facto we have scan all repo commits, which takes + // significant time on a Linux kernel checkout. + // If the blob hashes haven't been touched since one year, any reasonably + // fresh kernel branch will pass, so BaseForDiff is not really needed. + `--since="1 year ago"`, `--format=%H:%P`, } var fileNames []string |