path: root/Documentation/technical/api-revision-walking.txt
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authorBen Peart <>2017-09-22 16:35:40 (GMT)
committerJunio C Hamano <>2017-10-01 08:23:01 (GMT)
commit883e248b8a0fd88773cb902ab8e91273eb147d07 (patch)
treeb3b6fcd4f788c2ba0dd7bf6c8b9d19ebef1e5a0c /Documentation/technical/api-revision-walking.txt
parent7c545be9a1afb8031ff4df618a1f89d0764191cd (diff)
fsmonitor: teach git to optionally utilize a file system monitor to speed up detecting new or changed files.
When the index is read from disk, the fsmonitor index extension is used to flag the last known potentially dirty index entries. The registered core.fsmonitor command is called with the time the index was last updated and returns the list of files changed since that time. This list is used to flag any additional dirty cache entries and untracked cache directories. We can then use this valid state to speed up preload_index(), ie_match_stat(), and refresh_cache_ent() as they do not need to lstat() files to detect potential changes for those entries marked CE_FSMONITOR_VALID. In addition, if the untracked cache is turned on valid_cached_dir() can skip checking directories for new or changed files as fsmonitor will invalidate the cache only for those directories that have been identified as having potential changes. To keep the CE_FSMONITOR_VALID state accurate during git operations; when git updates a cache entry to match the current state on disk, it will now set the CE_FSMONITOR_VALID bit. Inversely, anytime git changes a cache entry, the CE_FSMONITOR_VALID bit is cleared and the corresponding untracked cache directory is marked invalid. Signed-off-by: Ben Peart <> Signed-off-by: Junio C Hamano <>
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