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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
	"Garima Singh" <garima.singh@microsoft.com>,
	"Derrick Stolee" <stolee@gmail.com>,
	"Jakub Narebski" <jnareb@gmail.com>, "Jeff King" <peff@peff.net>,
	"Taylor Blau" <me@ttaylorr.com>,
	"SZEDER Gábor" <szeder.dev@gmail.com>
Subject: [PATCH 04/34] commit-slab: add a function to deep free entries on the slab
Date: Fri, 29 May 2020 10:50:08 +0200
Message-ID: <20200529085038.26008-5-szeder.dev@gmail.com> (raw)
In-Reply-To: <20200529085038.26008-1-szeder.dev@gmail.com>

clear_##slabname() frees only the memory allocated for a commit slab
itself, but entries in the commit slab might own additional memory
outside the slab that should be freed as well.  We already have (at
least) one such commit slab, and this patch series is about to add one
more.

To free all additional memory owned by entries on the commit slab the
user of such a slab could iterate over all commits it knows about,
peek whether there is a valid entry associated with each commit, and
free the additional memory, if any.  Or it could rely on intimate
knowledge about the internals of the commit slab implementation, and
could itself iterate directly through all entries in the slab, and
free the additional memory.  Or it could just leak the additional
memory...

Introduce deep_clear_##slabname() to allow releasing memory owned by
commit slab entries by invoking the 'void free_fn(elemtype *ptr)'
function specified as parameter for each entry in the slab.

Use it in get_shallow_commits() in 'shallow.c' to replace an
open-coded iteration over a commit slab's entries.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 commit-slab-decl.h |  1 +
 commit-slab-impl.h | 13 +++++++++++++
 commit-slab.h      | 10 ++++++++++
 shallow.c          | 14 +++++---------
 4 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/commit-slab-decl.h b/commit-slab-decl.h
index adc7b46c83..286164b7e2 100644
--- a/commit-slab-decl.h
+++ b/commit-slab-decl.h
@@ -32,6 +32,7 @@ struct slabname {							\
 void init_ ##slabname## _with_stride(struct slabname *s, unsigned stride); \
 void init_ ##slabname(struct slabname *s);				\
 void clear_ ##slabname(struct slabname *s);				\
+void deep_clear_ ##slabname(struct slabname *s, void (*free_fn)(elemtype *ptr)); \
 elemtype *slabname## _at_peek(struct slabname *s, const struct commit *c, int add_if_missing); \
 elemtype *slabname## _at(struct slabname *s, const struct commit *c);	\
 elemtype *slabname## _peek(struct slabname *s, const struct commit *c)
diff --git a/commit-slab-impl.h b/commit-slab-impl.h
index 5c0eb91a5d..557738df27 100644
--- a/commit-slab-impl.h
+++ b/commit-slab-impl.h
@@ -38,6 +38,19 @@ scope void clear_ ##slabname(struct slabname *s)			\
 	FREE_AND_NULL(s->slab);						\
 }									\
 									\
+scope void deep_clear_ ##slabname(struct slabname *s, void (*free_fn)(elemtype *)) \
+{									\
+	unsigned int i;							\
+	for (i = 0; i < s->slab_count; i++) {				\
+		unsigned int j;						\
+		if (!s->slab[i])					\
+			continue;					\
+		for (j = 0; j < s->slab_size; j++)			\
+			free_fn(&s->slab[i][j * s->stride]);		\
+	}								\
+	clear_ ##slabname(s);						\
+}									\
+									\
 scope elemtype *slabname## _at_peek(struct slabname *s,			\
 						  const struct commit *c, \
 						  int add_if_missing)   \
diff --git a/commit-slab.h b/commit-slab.h
index 69bf0c807c..7bd472171e 100644
--- a/commit-slab.h
+++ b/commit-slab.h
@@ -42,6 +42,16 @@
  *
  *   Call this function before the slab falls out of scope to avoid
  *   leaking memory.
+ *
+ * - void deep_clear_indegree(struct indegree *, void (*free_fn)(int*))
+ *
+ *   Empties the slab, similar to clear_indegree(), but in addition it
+ *   calls the given 'free_fn' for each slab entry to release any
+ *   additional memory that might be owned by the entry (but not the
+ *   entry itself!).
+ *   Note that 'free_fn' might be called even for entries for which no
+ *   indegree_at() call has been made; in this case 'free_fn' is invoked
+ *   with a pointer to a zero-initialized location.
  */
 
 #define define_commit_slab(slabname, elemtype) \
diff --git a/shallow.c b/shallow.c
index 7fd04afed1..d02ba494ee 100644
--- a/shallow.c
+++ b/shallow.c
@@ -84,6 +84,10 @@ int is_repository_shallow(struct repository *r)
  * supports a "valid" flag.
  */
 define_commit_slab(commit_depth, int *);
+void free_depth_in_slab(int **ptr)
+{
+	FREE_AND_NULL(*ptr);
+}
 struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
 		int shallow_flag, int not_shallow_flag)
 {
@@ -150,15 +154,7 @@ struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
 			}
 		}
 	}
-	for (i = 0; i < depths.slab_count; i++) {
-		int j;
-
-		if (!depths.slab[i])
-			continue;
-		for (j = 0; j < depths.slab_size; j++)
-			free(depths.slab[i][j]);
-	}
-	clear_commit_depth(&depths);
+	deep_clear_commit_depth(&depths, free_depth_in_slab);
 
 	return result;
 }
-- 
2.27.0.rc1.431.g5c813f95dc


  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29  8:50 [PoC PATCH 00/34] An alternative modified path Bloom filters implementation SZEDER Gábor
2020-05-28 22:09 ` Johannes Schindelin
2020-05-29  8:50 ` [PATCH 01/34] tree-walk.c: don't match submodule entries for 'submod/anything' SZEDER Gábor
2020-05-29  8:50 ` [PATCH 02/34] commit-graph: fix parsing the Chunk Lookup table SZEDER Gábor
2020-05-29  8:50 ` [PATCH 03/34] commit-graph-format.txt: all multi-byte numbers are in network byte order SZEDER Gábor
2020-05-29  8:50 ` SZEDER Gábor [this message]
2020-06-04 16:43   ` [PATCH 04/34] commit-slab: add a function to deep free entries on the slab Derrick Stolee
2020-06-27 15:56     ` SZEDER Gábor
2020-06-29 11:30       ` Derrick Stolee
2020-05-29  8:50 ` [PATCH 05/34] diff.h: drop diff_tree_oid() & friends' return value SZEDER Gábor
2020-05-29  8:50 ` [PATCH 06/34] commit-graph: clean up #includes SZEDER Gábor
2020-05-29  8:50 ` [PATCH 07/34] commit-graph: simplify parse_commit_graph() #1 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 08/34] commit-graph: simplify parse_commit_graph() #2 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 09/34] commit-graph: simplify write_commit_graph_file() #1 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 10/34] commit-graph: simplify write_commit_graph_file() #2 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 11/34] commit-graph: allocate the 'struct chunk_info' array dinamically SZEDER Gábor
2020-05-29  8:50 ` [PATCH 12/34] commit-graph: unify the signatures of all write_graph_chunk_*() functions SZEDER Gábor
2020-05-29  8:50 ` [PATCH 13/34] commit-graph: simplify write_commit_graph_file() #3 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 14/34] commit-graph: check chunk sizes after writing SZEDER Gábor
2020-05-29  8:50 ` [PATCH 15/34] commit-graph-format.txt: document the modified path Bloom filter chunks SZEDER Gábor
2020-06-02 17:59   ` SZEDER Gábor
2020-05-29  8:50 ` [PATCH 16/34] Add a generic and minimal Bloom filter implementation SZEDER Gábor
2020-05-29  8:50 ` [PATCH 17/34] Import a streaming-capable Murmur3 hash function implementation SZEDER Gábor
2020-05-29  8:50 ` [PATCH 18/34] commit-graph: write "empty" Modified Path Bloom Filter Index chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 19/34] commit-graph: add commit slab for modified path Bloom filters SZEDER Gábor
2020-05-29  8:50 ` [PATCH 20/34] commit-graph: fill the Modified Path Bloom Filter Index chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 21/34] commit-graph: load and use " SZEDER Gábor
2020-05-29  8:50 ` [PATCH 22/34] commit-graph: write the Modified Path Bloom Filters chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 23/34] commit-graph: load and use " SZEDER Gábor
2020-05-29  8:50 ` [PATCH 24/34] commit-graph: check all leading directories in modified path Bloom filters SZEDER Gábor
2020-05-29  8:50 ` [PATCH 25/34] commit-graph: check embedded modified path Bloom filters with a mask SZEDER Gábor
2020-05-29  8:50 ` [PATCH 26/34] commit-graph: deduplicate modified path Bloom filters SZEDER Gábor
2020-05-29  8:50 ` [PATCH 27/34] commit-graph: load modified path Bloom filters for merge commits SZEDER Gábor
2020-05-29  8:50 ` [PATCH 28/34] commit-graph: write Modified Path Bloom Filter Merge Index chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 29/34] commit-graph: extract init and free write_commit_graph_context SZEDER Gábor
2020-05-29  8:50 ` [PATCH 30/34] commit-graph: move write_commit_graph_reachable below write_commit_graph SZEDER Gábor
2020-05-29  8:50 ` [PATCH 31/34] t7007-show: make the first test compatible with the next patch SZEDER Gábor
2020-05-29  8:50 ` [PATCH 32/34] PoC commit-graph: use revision walk machinery for '--reachable' SZEDER Gábor
2020-05-29  8:50 ` [PATCH 33/34] commit-graph: write modified path Bloom filters in "history order" SZEDER Gábor
2020-05-29  8:50 ` [PATCH 34/34] commit-graph: use modified path Bloom filters with wildcards, if possible SZEDER Gábor
2020-05-29 13:59 ` [PoC PATCH 00/34] An alternative modified path Bloom filters implementation Derrick Stolee
2020-06-01 23:25 ` Taylor Blau
2020-06-02 17:08   ` Junio C Hamano

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