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[80.216.12.205]) by smtp.gmail.com with ESMTPSA id n24sm2551554ljg.22.2018.03.18.07.25.48 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 18 Mar 2018 07:25:48 -0700 (PDT) From: =?UTF-8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?= To: pclouds@gmail.com Cc: avarab@gmail.com, e@80x24.org, git@vger.kernel.org, gitster@pobox.com, peff@peff.net Subject: [PATCH v6 08/11] pack-objects: shrink z_delta_size field in struct object_entry Date: Sun, 18 Mar 2018 15:25:23 +0100 Message-Id: <20180318142526.9378-9-pclouds@gmail.com> X-Mailer: git-send-email 2.17.0.rc0.347.gf9cf61673a In-Reply-To: <20180318142526.9378-1-pclouds@gmail.com> References: <20180317141033.21545-1-pclouds@gmail.com> <20180318142526.9378-1-pclouds@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org We only cache deltas when it's smaller than a certain limit. This limit defaults to 1000 but save its compressed length in a 64-bit field. Shrink that field down to 16 bits, so you can only cache 65kb deltas. Larger deltas must be recomputed at when the pack is written down. Signed-off-by: Nguyễn Thái Ngọc Duy --- Documentation/config.txt | 3 ++- builtin/pack-objects.c | 22 ++++++++++++++++------ pack-objects.h | 3 ++- 3 files changed, 20 insertions(+), 8 deletions(-) diff --git a/Documentation/config.txt b/Documentation/config.txt index 9bd3f5a789..00fa824448 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -2449,7 +2449,8 @@ pack.deltaCacheLimit:: The maximum size of a delta, that is cached in linkgit:git-pack-objects[1]. This cache is used to speed up the writing object phase by not having to recompute the final delta - result once the best match for all objects is found. Defaults to 1000. + result once the best match for all objects is found. + Defaults to 1000. Maximum value is 65535. pack.threads:: Specifies the number of threads to spawn when searching for best diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c index b39234f7fb..372afe48c4 100644 --- a/builtin/pack-objects.c +++ b/builtin/pack-objects.c @@ -2105,12 +2105,19 @@ static void find_deltas(struct object_entry **list, unsigned *list_size, * between writes at that moment. */ if (entry->delta_data && !pack_to_stdout) { - entry->z_delta_size = do_compress(&entry->delta_data, - entry->delta_size); - cache_lock(); - delta_cache_size -= entry->delta_size; - delta_cache_size += entry->z_delta_size; - cache_unlock(); + unsigned long size; + + size = do_compress(&entry->delta_data, entry->delta_size); + if (size < (1 << OE_Z_DELTA_BITS)) { + entry->z_delta_size = size; + cache_lock(); + delta_cache_size -= entry->delta_size; + delta_cache_size += entry->z_delta_size; + cache_unlock(); + } else { + FREE_AND_NULL(entry->delta_data); + entry->z_delta_size = 0; + } } /* if we made n a delta, and if n is already at max @@ -3089,6 +3096,9 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix) if (depth >= (1 << OE_DEPTH_BITS)) die(_("delta chain depth %d is greater than maximum limit %d"), depth, (1 << OE_DEPTH_BITS) - 1); + if (cache_max_small_delta_size >= (1 << OE_Z_DELTA_BITS)) + die(_("pack.deltaCacheLimit is greater than maximum limit %d"), + (1 << OE_Z_DELTA_BITS) - 1); argv_array_push(&rp, "pack-objects"); if (thin) { diff --git a/pack-objects.h b/pack-objects.h index 594a213554..c12219385a 100644 --- a/pack-objects.h +++ b/pack-objects.h @@ -4,6 +4,7 @@ #define OE_DFS_STATE_BITS 2 #define OE_DEPTH_BITS 12 #define OE_IN_PACK_BITS 14 +#define OE_Z_DELTA_BITS 16 /* * State flags for depth-first search used for analyzing delta cycles. @@ -79,7 +80,7 @@ struct object_entry { */ void *delta_data; /* cached delta (uncompressed) */ unsigned long delta_size; /* delta data size (uncompressed) */ - unsigned long z_delta_size; /* delta data size (compressed) */ + unsigned z_delta_size:OE_Z_DELTA_BITS; unsigned type_:TYPE_BITS; unsigned in_pack_type:TYPE_BITS; /* could be delta */ unsigned type_valid:1; -- 2.17.0.rc0.347.gf9cf61673a