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Merge branch 'nd/unpack-trees-with-cache-tree'

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The unpack_trees() API used in checking out a branch and merging
walks one or more trees along with the index.  When the cache-tree
in the index tells us that we are walking a tree whose flattened
contents is known (i.e. matches a span in the index), as linearly
scanning a span in the index is much more efficient than having to
open tree objects recursively and listing their entries, the walk
can be optimized, which is done in this topic.

* nd/unpack-trees-with-cache-tree:
  Document update for nd/unpack-trees-with-cache-tree
  cache-tree: verify valid cache-tree in the test suite
  unpack-trees: add missing cache invalidation
  unpack-trees: reuse (still valid) cache-tree from src_index
  unpack-trees: reduce malloc in cache-tree walk
  unpack-trees: optimize walking same trees with cache-tree
  unpack-trees: add performance tracing
  trace.h: support nested performance tracing
This commit is contained in:
Junio C Hamano
2018-09-17 13:53:53 -07:00
parent 1b7a91da71 5f4436a721
commit 7e794d0a3f
12 changed files with 344 additions and 22 deletions
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4
preload-index.c
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@@ -78,7 +78,6 @@ static void preload_index(struct index_state *index,
{
int threads, i, work, offset;
struct thread_data data[MAX_PARALLEL];
uint64_t start = getnanotime();
if (!core_preload_index)
return;
@@ -88,6 +87,7 @@ static void preload_index(struct index_state *index,
threads = 2;
if (threads < 2)
return;
trace_performance_enter();
if (threads > MAX_PARALLEL)
threads = MAX_PARALLEL;
offset = 0;
@@ -109,7 +109,7 @@ static void preload_index(struct index_state *index,
if (pthread_join(p->pthread, NULL))
die("unable to join threaded lstat");
}
trace_performance_since(start, "preload index");
trace_performance_leave("preload index");
}
#endif