Refactor huge allocation to be managed by arenas.

Refactor huge allocation to be managed by arenas (though the global
red-black tree of huge allocations remains for lookup during
deallocation).  This is the logical conclusion of recent changes that 1)
made per arena dss precedence apply to huge allocation, and 2) made it
possible to replace the per arena chunk allocation/deallocation
functions.

Remove the top level huge stats, and replace them with per arena huge
stats.

Normalize function names and types to *dalloc* (some were *dealloc*).

Remove the --enable-mremap option.  As jemalloc currently operates, this
is a performace regression for some applications, but planned work to
logarithmically space huge size classes should provide similar amortized
performance.  The motivation for this change was that mremap-based huge
reallocation forced leaky abstractions that prevented refactoring.

1 files changed, 11 insertions, 7 deletions

diff --git a/test/unit/stats.c b/test/unit/stats.c
index 03a55c7..ab87b29 100644
--- a/test/unit/stats.c
+++ b/test/unit/stats.c
@@ -60,7 +60,7 @@ TEST_BEGIN(test_stats_huge)
 	void *p;
 	uint64_t epoch;
 	size_t allocated;
-	uint64_t nmalloc, ndalloc;
+	uint64_t nmalloc, ndalloc, nrequests;
 	size_t sz;
 	int expected = config_stats ? 0 : ENOENT;
 
@@ -71,19 +71,23 @@ TEST_BEGIN(test_stats_huge)
 	    "Unexpected mallctl() failure");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.huge.allocated", &allocated, &sz, NULL, 0),
-	    expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.huge.allocated", &allocated, &sz,
+	    NULL, 0), expected, "Unexpected mallctl() result");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.huge.nmalloc", &nmalloc, &sz, NULL, 0),
-	    expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.huge.ndalloc", &ndalloc, &sz, NULL, 0),
-	    expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.huge.nmalloc", &nmalloc, &sz, NULL,
+	    0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.huge.ndalloc", &ndalloc, &sz, NULL,
+	    0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.huge.nrequests", &nrequests, &sz,
+	    NULL, 0), expected, "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_zu_gt(allocated, 0,
 		    "allocated should be greater than zero");
 		assert_u64_ge(nmalloc, ndalloc,
 		    "nmalloc should be at least as large as ndalloc");
+		assert_u64_le(nmalloc, nrequests,
+		    "nmalloc should no larger than nrequests");
 	}
 
 	dallocx(p, 0);