Re: [PATCH libdrm 2/9] tests/hash: extract test out of xf86drmHash.c

On Sun, 2015-03-22 at 22:03 +0000, Emil Velikov wrote:

This way with follow up commits we can fix it and wire it up to make check

Signed-off-by: Emil Velikov emil.l.velikov@gmail.com

tests/Makefile.am | 3 +- tests/hash.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ xf86drmHash.c | 174 +++---------------------------------------- 3 files changed, 231 insertions(+), 165 deletions(-) create mode 100644 tests/hash.c

diff --git a/tests/Makefile.am b/tests/Makefile.am index 10f54e3..ea826b5 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -29,7 +29,8 @@ LDADD = $(top_builddir)/libdrm.la

check_PROGRAMS = \ dristat \

• drmstat

• drmstat \
• hash

if HAVE_NOUVEAU SUBDIRS += nouveau diff --git a/tests/hash.c b/tests/hash.c new file mode 100644 index 0000000..d57d2dc --- /dev/null +++ b/tests/hash.c @@ -0,0 +1,219 @@ +/* xf86drmHash.c -- Small hash table support for integer -> integer mapping

• • Created: Sun Apr 18 09:35:45 1999 by faith@precisioninsight.com
• • Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
• • All Rights Reserved.
• • Permission is hereby granted, free of charge, to any person obtaining a
• • copy of this software and associated documentation files (the "Software"),
• • to deal in the Software without restriction, including without limitation
• • the rights to use, copy, modify, merge, publish, distribute, sublicense,
• • and/or sell copies of the Software, and to permit persons to whom the
• • Software is furnished to do so, subject to the following conditions:
• • The above copyright notice and this permission notice (including the next
• • paragraph) shall be included in all copies or substantial portions of the
• • Software.
• • THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
• • IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
• • FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
• • PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
• • OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
• • ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
• • DEALINGS IN THE SOFTWARE.
• • Authors: Rickard E. (Rik) Faith faith@valinux.com
• • DESCRIPTION
• • This file contains a straightforward implementation of a fixed-sized
• • hash table using self-organizing linked lists [Knuth73, pp. 398-399] for
• • collision resolution. There are two potentially interesting things
• • about this implementation:
• • 1. The table is power-of-two sized. Prime sized tables are more
• • traditional, but do not have a significant advantage over power-of-two
• • sized table, especially when double hashing is not used for collision
• • resolution.
• • 2. The hash computation uses a table of random integers [Hanson97,
• • pp. 39-41].
• • FUTURE ENHANCEMENTS
• • With a table size of 512, the current implementation is sufficient for a
• • few hundred keys. Since this is well above the expected size of the
• • tables for which this implementation was designed, the implementation of
• • dynamic hash tables was postponed until the need arises. A common (and
• • naive) approach to dynamic hash table implementation simply creates a
• • new hash table when necessary, rehashes all the data into the new table,
• • and destroys the old table. The approach in [Larson88] is superior in
• • two ways: 1) only a portion of the table is expanded when needed,
• • distributing the expansion cost over several insertions, and 2) portions
• • of the table can be locked, enabling a scalable thread-safe
• • implementation.
• • REFERENCES
• • [Hanson97] David R. Hanson. C Interfaces and Implementations:
• • Techniques for Creating Reusable Software. Reading, Massachusetts:
• • Addison-Wesley, 1997.
• • [Knuth73] Donald E. Knuth. The Art of Computer Programming. Volume 3:
• • Sorting and Searching. Reading, Massachusetts: Addison-Wesley, 1973.
• • [Larson88] Per-Ake Larson. "Dynamic Hash Tables". CACM 31(4), April
• • 1988, pp. 446-457.
• */

+#include <stdio.h> +#include <stdlib.h>

+#include "xf86drm.h"

+#define HASH_SIZE 512 /* Good for about 100 entries */

• 		/* If you change this value, you probably
  

•                               have to change the HashHash hashing
  

•                               function! */
  

+typedef struct HashBucket {

• unsigned long key;
• void *value;
• struct HashBucket *next;

+} HashBucket, *HashBucketPtr;

+typedef struct HashTable {

• unsigned long magic;
• unsigned long entries;
• unsigned long hits; /* At top of linked list */
• unsigned long partials; /* Not at top of linked list */
• unsigned long misses; /* Not in table */
• HashBucketPtr buckets[HASH_SIZE];
• int p0;
• HashBucketPtr p1;

+} HashTable, *HashTablePtr;

I don't think it's a good idea to duplicate these. maybe having an internal header would be a better way to go.

+#define DIST_LIMIT 10 +static int dist[DIST_LIMIT];

+static void clear_dist(void) {

• int i;
• for (i = 0; i < DIST_LIMIT; i++) dist[i] = 0;

+}

+static int count_entries(HashBucketPtr bucket) +{

• int count = 0;
• for (; bucket; bucket = bucket->next) ++count;
• return count;

+}

+static void update_dist(int count) +{

• if (count >= DIST_LIMIT) ++dist[DIST_LIMIT-1];
• else ++dist[count];

+}

+static void compute_dist(HashTablePtr table) +{

• int i;
• HashBucketPtr bucket;
• printf("Entries = %ld, hits = %ld, partials = %ld, misses = %ld\n",

•   table->entries, table->hits, table->partials, table->misses);
  

• clear_dist();
• for (i = 0; i < HASH_SIZE; i++) {
• bucket = table->buckets[i];
• update_dist(count_entries(bucket));
• }
• for (i = 0; i < DIST_LIMIT; i++) {
• if (i != DIST_LIMIT-1) printf("%5d %10d\n", i, dist[i]);
• else printf("other %10d\n", dist[i]);
• }

+}

+static void check_table(HashTablePtr table,

• 	unsigned long key, unsigned long value)
  

+{

• unsigned long retval = 0;
• int retcode = drmHashLookup(table, key, &retval);
• switch (retcode) {
• case -1:
• printf("Bad magic = 0x%08lx:"

•       " key = %lu, expected = %lu, returned = %lu\n",
  

•       table->magic, key, value, retval);
  

• break;
• case 1:
• printf("Not found: key = %lu, expected = %lu returned = %lu\n",

•       key, value, retval);
  

• break;
• case 0:
• if (value != retval)

•    printf("Bad value: key = %lu, expected = %lu, returned = %lu\n",
  

•    key, value, retval);
  

• break;
• default:
• printf("Bad retcode = %d: key = %lu, expected = %lu, returned = %lu\n",

•       retcode, key, value, retval);
  

• break;
• }

+}

+int main(void) +{

• HashTablePtr table;
• int i;
• printf("\n***** 256 consecutive integers ****\n");
• table = drmHashCreate();
• for (i = 0; i < 256; i++) drmHashInsert(table, i, i);
• for (i = 0; i < 256; i++) check_table(table, i, i);
• for (i = 256; i >= 0; i--) check_table(table, i, i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 1024 consecutive integers ****\n");
• table = drmHashCreate();
• for (i = 0; i < 1024; i++) drmHashInsert(table, i, i);
• for (i = 0; i < 1024; i++) check_table(table, i, i);
• for (i = 1024; i >= 0; i--) check_table(table, i, i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 1024 consecutive page addresses (4k pages) ****\n");
• table = drmHashCreate();
• for (i = 0; i < 1024; i++) drmHashInsert(table, i*4096, i);
• for (i = 0; i < 1024; i++) check_table(table, i*4096, i);
• for (i = 1024; i >= 0; i--) check_table(table, i*4096, i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 1024 random integers ****\n");
• table = drmHashCreate();
• srandom(0xbeefbeef);
• for (i = 0; i < 1024; i++) drmHashInsert(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 1024; i++) check_table(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 1024; i++) check_table(table, random(), i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 5000 random integers ****\n");
• table = drmHashCreate();
• srandom(0xbeefbeef);
• for (i = 0; i < 5000; i++) drmHashInsert(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 5000; i++) check_table(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 5000; i++) check_table(table, random(), i);
• compute_dist(table);
• drmHashDestroy(table);
• return 0;

+} diff --git a/xf86drmHash.c b/xf86drmHash.c index 82cbc2a..82512a8 100644 --- a/xf86drmHash.c +++ b/xf86drmHash.c @@ -71,11 +71,7 @@ #include <stdio.h> #include <stdlib.h>

-#define HASH_MAIN 0

-#if !HASH_MAIN -# include "xf86drm.h" -#endif +#include "xf86drm.h"

#define HASH_MAGIC 0xdeadbeef #define HASH_DEBUG 0 @@ -84,23 +80,6 @@ have to change the HashHash hashing function! */

-#if HASH_MAIN -#define HASH_ALLOC malloc -#define HASH_FREE free -#define HASH_RANDOM_DECL -#define HASH_RANDOM_INIT(seed) srandom(seed) -#define HASH_RANDOM random() -#define HASH_RANDOM_DESTROY -#else -#define HASH_ALLOC drmMalloc -#define HASH_FREE drmFree -#define HASH_RANDOM_DECL void *state -#define HASH_RANDOM_INIT(seed) state = drmRandomCreate(seed) -#define HASH_RANDOM drmRandom(state) -#define HASH_RANDOM_DESTROY drmRandomDestroy(state)

-#endif

typedef struct HashBucket { unsigned long key; void *value; @@ -118,14 +97,6 @@ typedef struct HashTable { HashBucketPtr p1; } HashTable, *HashTablePtr;

-#if HASH_MAIN -extern void *drmHashCreate(void); -extern int drmHashDestroy(void *t); -extern int drmHashLookup(void *t, unsigned long key, unsigned long *value); -extern int drmHashInsert(void *t, unsigned long key, unsigned long value); -extern int drmHashDelete(void *t, unsigned long key); -#endif

static unsigned long HashHash(unsigned long key) { unsigned long hash = 0; @@ -135,10 +106,10 @@ static unsigned long HashHash(unsigned long key) int i;

 if (!init) {

• HASH_RANDOM_DECL;
• HASH_RANDOM_INIT(37);
• for (i = 0; i < 256; i++) scatter[i] = HASH_RANDOM;
• HASH_RANDOM_DESTROY;

• void *state;
• state = drmRandomCreate(37);
• for (i = 0; i < 256; i++) scatter[i] = drmRandom(state);
• drmRandomDestroy(state); ++init; }

@@ -159,7 +130,7 @@ void *drmHashCreate(void) HashTablePtr table; int i;

• table = HASH_ALLOC(sizeof(*table));

• table = drmMalloc(sizeof(*table)); if (!table) return NULL; table->magic = HASH_MAGIC; table->entries = 0;

@@ -183,11 +154,11 @@ int drmHashDestroy(void *t) for (i = 0; i < HASH_SIZE; i++) { for (bucket = table->buckets[i]; bucket;) { next = bucket->next;

•    HASH_FREE(bucket);
  

•    drmFree(bucket);
   bucket = next;
  

  } }

• HASH_FREE(table);

• drmFree(table); return 0;

}

@@ -245,7 +216,7 @@ int drmHashInsert(void *t, unsigned long key, void *value)

 if (HashFind(table, key, &hash)) return 1; /* Already in table */

• bucket = HASH_ALLOC(sizeof(*bucket));

• bucket = drmMalloc(sizeof(*bucket)); if (!bucket) return -1; /* Error */ bucket->key = key; bucket->value = value;

@@ -270,7 +241,7 @@ int drmHashDelete(void *t, unsigned long key) if (!bucket) return 1; /* Not found */

 table->buckets[hash] = bucket->next;

• HASH_FREE(bucket);

• drmFree(bucket); return 0;

}

@@ -301,128 +272,3 @@ int drmHashFirst(void *t, unsigned long *key, void **value) table->p1 = table->buckets[0]; return drmHashNext(table, key, value); }

-#if HASH_MAIN -#define DIST_LIMIT 10 -static int dist[DIST_LIMIT];

-static void clear_dist(void) {

• int i;
• for (i = 0; i < DIST_LIMIT; i++) dist[i] = 0;

-}

-static int count_entries(HashBucketPtr bucket) -{

• int count = 0;
• for (; bucket; bucket = bucket->next) ++count;
• return count;

-}

-static void update_dist(int count) -{

• if (count >= DIST_LIMIT) ++dist[DIST_LIMIT-1];
• else ++dist[count];

-}

-static void compute_dist(HashTablePtr table) -{

• int i;
• HashBucketPtr bucket;
• printf("Entries = %ld, hits = %ld, partials = %ld, misses = %ld\n",

•   table->entries, table->hits, table->partials, table->misses);
  

• clear_dist();
• for (i = 0; i < HASH_SIZE; i++) {
• bucket = table->buckets[i];
• update_dist(count_entries(bucket));
• }
• for (i = 0; i < DIST_LIMIT; i++) {
• if (i != DIST_LIMIT-1) printf("%5d %10d\n", i, dist[i]);
• else printf("other %10d\n", dist[i]);
• }

-}

-static void check_table(HashTablePtr table,

• 	unsigned long key, unsigned long value)
  

-{

• unsigned long retval = 0;
• int retcode = drmHashLookup(table, key, &retval);
• switch (retcode) {
• case -1:
• printf("Bad magic = 0x%08lx:"

•       " key = %lu, expected = %lu, returned = %lu\n",
  

•       table->magic, key, value, retval);
  

• break;
• case 1:
• printf("Not found: key = %lu, expected = %lu returned = %lu\n",

•       key, value, retval);
  

• break;
• case 0:
• if (value != retval)

•    printf("Bad value: key = %lu, expected = %lu, returned = %lu\n",
  

•    key, value, retval);
  

• break;
• default:
• printf("Bad retcode = %d: key = %lu, expected = %lu, returned = %lu\n",

•       retcode, key, value, retval);
  

• break;
• }

-}

-int main(void) -{

• HashTablePtr table;
• int i;
• printf("\n***** 256 consecutive integers ****\n");
• table = drmHashCreate();
• for (i = 0; i < 256; i++) drmHashInsert(table, i, i);
• for (i = 0; i < 256; i++) check_table(table, i, i);
• for (i = 256; i >= 0; i--) check_table(table, i, i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 1024 consecutive integers ****\n");
• table = drmHashCreate();
• for (i = 0; i < 1024; i++) drmHashInsert(table, i, i);
• for (i = 0; i < 1024; i++) check_table(table, i, i);
• for (i = 1024; i >= 0; i--) check_table(table, i, i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 1024 consecutive page addresses (4k pages) ****\n");
• table = drmHashCreate();
• for (i = 0; i < 1024; i++) drmHashInsert(table, i*4096, i);
• for (i = 0; i < 1024; i++) check_table(table, i*4096, i);
• for (i = 1024; i >= 0; i--) check_table(table, i*4096, i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 1024 random integers ****\n");
• table = drmHashCreate();
• srandom(0xbeefbeef);
• for (i = 0; i < 1024; i++) drmHashInsert(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 1024; i++) check_table(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 1024; i++) check_table(table, random(), i);
• compute_dist(table);
• drmHashDestroy(table);
• printf("\n***** 5000 random integers ****\n");
• table = drmHashCreate();
• srandom(0xbeefbeef);
• for (i = 0; i < 5000; i++) drmHashInsert(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 5000; i++) check_table(table, random(), i);
• srandom(0xbeefbeef);
• for (i = 0; i < 5000; i++) check_table(table, random(), i);
• compute_dist(table);
• drmHashDestroy(table);
• return 0;

-} -#endif