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[104.178.186.189]) by smtp.gmail.com with ESMTPSA id s81-20020a254554000000b00b9ba6a3b675sm2645232yba.50.2023.05.08.14.59.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 May 2023 14:59:40 -0700 (PDT) Date: Mon, 8 May 2023 17:59:38 -0400 From: Taylor Blau To: git@vger.kernel.org Cc: Jeff King , Derrick Stolee , Junio C Hamano Subject: [PATCH 00/15] refs: implement skip lists for packed backend Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org This series implements the concept of a skip list for the packed refs backend. In situations where the caller has many references they want to exclude, the packed-refs iterator maintains a list of (start, end) tuples of regions to jump over (i.e. if `iter->pos == start`, jump forward to `end`). This series implements that concept, and uses it to power a couple of new things: - `git for-each-ref --exclude`, which allows callers to specify prefixes they wish to discard. In a synthetic example, the naive implementation improved runtime from ~820ms to enumerate all references and discard unwanted ones, down to ~106ms with `--exclude`. By the end of the series, this time drops to under ~5ms. - `git receive-pack` uses the new skip-list machinery to avoid visiting references hidden via a hideRefs rule. - `git upload-pack` has an analogous optimization as above (though it can't kick in quite as often for reasons described in that patch). The series is laid out as follows: - The first five patches are preparatory (various refs.c and ref-filter cleanup). - The sixth patch provides a naive implementation of `--exclude`. - The next four patches prepare for and implement skip lists in the packed-refs backend. - The last five patches apply the optimization in `upload-pack` and `receive-pack`. The series is ordered so that any prefix of sections list above could be queued independently. Thanks in advance for your review. Jeff King (5): refs.c: rename `ref_filter` ref-filter.h: provide `REF_FILTER_INIT` ref-filter: clear reachable list pointers after freeing ref-filter: add ref_filter_clear() ref-filter.c: parameterize match functions over patterns Taylor Blau (10): builtin/for-each-ref.c: add `--exclude` option refs: plumb `exclude_patterns` argument throughout refs/packed-backend.c: refactor `find_reference_location()` refs/packed-backend.c: implement skip lists to avoid excluded pattern(s) refs/packed-backend.c: add trace2 counters for skip list revision.h: store hidden refs in a `strvec` refs/packed-backend.c: ignore complicated hidden refs rules refs.h: let `for_each_namespaced_ref()` take excluded patterns upload-pack.c: avoid enumerating hidden refs where possible builtin/receive-pack.c: avoid enumerating hidden references Documentation/git-for-each-ref.txt | 6 + builtin/branch.c | 4 +- builtin/for-each-ref.c | 8 +- builtin/receive-pack.c | 7 +- builtin/tag.c | 4 +- http-backend.c | 2 +- ls-refs.c | 8 +- ref-filter.c | 61 ++++++-- ref-filter.h | 12 ++ refs.c | 61 ++++---- refs.h | 15 +- refs/debug.c | 5 +- refs/files-backend.c | 5 +- refs/packed-backend.c | 222 ++++++++++++++++++++++++++--- refs/refs-internal.h | 7 +- revision.c | 4 +- revision.h | 5 +- t/helper/test-reach.c | 2 +- t/helper/test-ref-store.c | 10 ++ t/t1419-exclude-refs.sh | 131 +++++++++++++++++ t/t6300-for-each-ref.sh | 35 +++++ trace2.h | 2 + trace2/tr2_ctr.c | 5 + upload-pack.c | 43 ++++-- 24 files changed, 559 insertions(+), 105 deletions(-) create mode 100755 t/t1419-exclude-refs.sh -- 2.40.1.477.g956c797dfc