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Автор SHA1 Сообщение Дата
Neeraj Singh 820079f461 unpack-trees:virtualfilesystem: Improve efficiency of clear_ce_flags
When the virtualfilesystem is enabled the previous implementation of
clear_ce_flags would iterate all of the cache entries and query whether
each one is in the virtual filesystem to determine whether to clear one
of the SKIP_WORKTREE bits. For each cache entry, we would do a hash
lookup for each parent directory in the is_included_in_virtualfilesystem
function.

The former approach is slow for a typical Windows OS enlistment with
3 million files where only a small percentage is in the virtual
filesystem. The cost is
O(n_index_entries * n_chars_per_path * n_parent_directories_per_path).

In this change, we use the same approach as apply_virtualfilesystem,
which iterates the set of entries in the virtualfilesystem and searches
in the cache for the corresponding entries in order to clear their
flags. This approach has a cost of
O(n_virtual_filesystem_entries * n_chars_per_path * log(n_index_entries)).

The apply_virtualfilesystem code was refactored a bit and modified to
clear flags for all names that 'alias' a given virtual filesystem name
when ignore_case is set.

n_virtual_filesystem_entries is typically much less than
n_index_entries, in which case the new approach is much faster. We wind
up building the name hash for the index, but this occurs quickly thanks
to the multi-threading.

Signed-off-by: Neeraj Singh <neerajsi@ntdev.microsoft.com>
2024-05-14 20:10:04 +02:00
Ben Peart d29907eb32 Add virtual file system settings and hook proc
On index load, clear/set the skip worktree bits based on the virtual
file system data. Use virtual file system data to update skip-worktree
bit in unpack-trees. Use virtual file system data to exclude files and
folders not explicitly requested.

Update 2022-04-05: disable the "present-despite-SKIP_WORKTREE" file removal
behavior when 'core.virtualfilesystem' is enabled.

Signed-off-by: Ben Peart <benpeart@microsoft.com>
2024-05-14 20:09:57 +02:00