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Posted to commits@subversion.apache.org by sv...@apache.org on 2015/09/04 06:00:32 UTC
svn commit: r1701154 - in /subversion/branches/1.8.x: ./ STATUS subversion/
subversion/libsvn_delta/text_delta.c
Author: svn-role
Date: Fri Sep 4 04:00:32 2015
New Revision: 1701154
URL: http://svn.apache.org/r1701154
Log:
Merge the 1.8.x-r1618472 branch:
* r1618472, r1618841, r1632635, r1640832
Fix a segfault with old style text delta.
Justification:
Compiling with -O3 in GCC 4.9 produces code that segfaults. The newer
1.9 / trunk code is simpler and compiles just fine. Also, that code
section is no longer performance critical.
Notes:
The branch code in text_delta is now the same as 1.9 / trunk, except for
a stream API usage and an unused function.
Branch:
^/subversion/branches/1.8.x-r1618472
Votes:
+1: stefan2, brane, rhuijben
Modified:
subversion/branches/1.8.x/ (props changed)
subversion/branches/1.8.x/STATUS
subversion/branches/1.8.x/subversion/ (props changed)
subversion/branches/1.8.x/subversion/libsvn_delta/text_delta.c
Propchange: subversion/branches/1.8.x/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Fri Sep 4 04:00:32 2015
@@ -45,6 +45,7 @@
/subversion/branches/1.8.x-r1590751:1660348-1660561
/subversion/branches/1.8.x-r1594223:1594224-1606975
/subversion/branches/1.8.x-r1611380:1647889-1657742
+/subversion/branches/1.8.x-r1618472:1692945-1701153
/subversion/branches/1.8.x-r1619380:1619398-1645562,1645571-1667451
/subversion/branches/1.8.x-r1619774:1626728-1640478
/subversion/branches/1.8.x-r1621978:1622021-1640850
@@ -146,5 +147,5 @@
/subversion/branches/uris-as-urls:1060426-1064427
/subversion/branches/verify-at-commit:1462039-1462408
/subversion/branches/wc-collate-path:1407642
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/subversion/trunk/subversion/tests:1652182
Modified: subversion/branches/1.8.x/STATUS
URL: http://svn.apache.org/viewvc/subversion/branches/1.8.x/STATUS?rev=1701154&r1=1701153&r2=1701154&view=diff
==============================================================================
--- subversion/branches/1.8.x/STATUS (original)
+++ subversion/branches/1.8.x/STATUS Fri Sep 4 04:00:32 2015
@@ -93,20 +93,6 @@ Veto-blocked changes:
Approved changes:
=================
- * r1618472, r1618841, r1632635, r1640832
- Fix a segfault with old style text delta.
- Justification:
- Compiling with -O3 in GCC 4.9 produces code that segfaults. The newer
- 1.9 / trunk code is simpler and compiles just fine. Also, that code
- section is no longer performance critical.
- Notes:
- The branch code in text_delta is now the same as 1.9 / trunk, except for
- a stream API usage and an unused function.
- Branch:
- ^/subversion/branches/1.8.x-r1618472
- Votes:
- +1: stefan2, brane, rhuijben
-
* r1669955
Reduce FSFS memory allocation in Apache with unbounded MaxFreeMem.
Justification:
Propchange: subversion/branches/1.8.x/subversion/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Fri Sep 4 04:00:32 2015
@@ -45,6 +45,7 @@
/subversion/branches/1.8.x-r1594223/subversion:1594224-1606975
/subversion/branches/1.8.x-r1611379/subversion:1612525-1640664
/subversion/branches/1.8.x-r1611380/subversion:1647889-1657742
+/subversion/branches/1.8.x-r1618472/subversion:1692945-1701153
/subversion/branches/1.8.x-r1619380/subversion:1619398-1645562,1645571-1667451
/subversion/branches/1.8.x-r1619774/subversion:1626728-1640478
/subversion/branches/1.8.x-r1621978/subversion:1622021-1640850
@@ -146,4 +147,4 @@
/subversion/branches/uris-as-urls/subversion:1060426-1064427
/subversion/branches/verify-at-commit/subversion:1462039-1462408
/subversion/branches/wc-collate-path/subversion:1407642
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+/subversion/trunk/subversion:1467440,1467450,1467481,1467587,1467597,1467668,1467675,1467803,1467807,1467951,1468109,1468116,1468151,1468347,1468395,1468439,1468487,1468565-1468566,1468980,1469248,1469363,1469478,1469489,1469512-1469513,1469550,1469556,1469645,1469674,1469833,1469862,1469866,1469871,1469994,1470031,1470037,1470221,1470238,1470246,1470248,1470537,1470650,1470738,1470781,1470898,1470904,1470908,1470913,1470936,1470993-1470994,1471028-1471029,1471107,1471153,1471302,1471443,1471490,1471744,1475704,1475724,1475772,1475963,1476092,1476155,1476181,1476193,1476254,1476359,1476366,1476607,1477294,1477359,1477729-1477730,1477876,1477891,1478001,1478220-1478221,1478465,1478617,1478897,1478951,1478987,1478998,1479320-1479321,1479323,1479326,1479329,1479540,1479563,1479605,1479896,1480054,1480077,1480080,1480082,1480119,1480149,1480344,1480412,1480426,1480442,1480616,1480641-1480642,1480664,1480669,1480681,1480723,1480738,1480765,1481010,1481418,1481594,1481596,1481625,1481627-
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Modified: subversion/branches/1.8.x/subversion/libsvn_delta/text_delta.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.8.x/subversion/libsvn_delta/text_delta.c?rev=1701154&r1=1701153&r2=1701154&view=diff
==============================================================================
--- subversion/branches/1.8.x/subversion/libsvn_delta/text_delta.c (original)
+++ subversion/branches/1.8.x/subversion/libsvn_delta/text_delta.c Fri Sep 4 04:00:32 2015
@@ -623,68 +623,31 @@ size_buffer(char **buf, apr_size_t *buf_
return SVN_NO_ERROR;
}
-/* Copy LEN bytes from SOURCE to TARGET, optimizing for the case where LEN
- * is often very small. Return a pointer to the first byte after the copied
- * target range, unlike standard memcpy(), as a potential further
- * optimization for the caller.
- *
- * memcpy() is hard to tune for a wide range of buffer lengths. Therefore,
- * it is often tuned for high throughput on large buffers and relatively
- * low latency for mid-sized buffers (tens of bytes). However, the overhead
- * for very small buffers (<10 bytes) is still high. Even passing the
- * parameters, for instance, may take as long as copying 3 bytes.
- *
- * Because short copy sequences seem to be a common case, at least in
- * "format 2" FSFS repositories, we copy them directly. Larger buffer sizes
- * aren't hurt measurably by the exta 'if' clause. */
-static APR_INLINE char *
-fast_memcpy(char *target, const char *source, apr_size_t len)
-{
- if (len > 7)
- {
- memcpy(target, source, len);
- target += len;
- }
- else
- {
- /* memcpy is not exactly fast for small block sizes.
- * Since they are common, let's run optimized code for them. */
- const char *end = source + len;
- for (; source != end; source++)
- *(target++) = *source;
- }
-
- return target;
-}
-
/* Copy LEN bytes from SOURCE to TARGET. Unlike memmove() or memcpy(),
* create repeating patterns if the source and target ranges overlap.
* Return a pointer to the first byte after the copied target range. */
static APR_INLINE char *
patterning_copy(char *target, const char *source, apr_size_t len)
{
- const char *end = source + len;
-
- /* On many machines, we can do "chunky" copies. */
-
-#if SVN_UNALIGNED_ACCESS_IS_OK
-
- if (end + sizeof(apr_uint32_t) <= target)
+ /* If the source and target overlap, repeat the overlapping pattern
+ in the target buffer. Always copy from the source buffer because
+ presumably it will be in the L1 cache after the first iteration
+ and doing this should avoid pipeline stalls due to write/read
+ dependencies. */
+ const apr_size_t overlap = target - source;
+ while (len > overlap)
{
- /* Source and target are at least 4 bytes apart, so we can copy in
- * 4-byte chunks. */
- for (; source + sizeof(apr_uint32_t) <= end;
- source += sizeof(apr_uint32_t),
- target += sizeof(apr_uint32_t))
- *(apr_uint32_t *)(target) = *(apr_uint32_t *)(source);
+ memcpy(target, source, overlap);
+ target += overlap;
+ len -= overlap;
}
-#endif
-
- /* fall through to byte-wise copy (either for the below-chunk-size tail
- * or the whole copy) */
- for (; source != end; source++)
- *(target++) = *source;
+ /* Copy any remaining source pattern. */
+ if (len)
+ {
+ memcpy(target, source, len);
+ target += len;
+ }
return target;
}
@@ -697,6 +660,11 @@ svn_txdelta_apply_instructions(svn_txdel
const svn_txdelta_op_t *op;
apr_size_t tpos = 0;
+ /* Nothing to do for empty buffers.
+ * This check allows for NULL TBUF in that case. */
+ if (*tlen == 0)
+ return;
+
for (op = window->ops; op < window->ops + window->num_ops; op++)
{
const apr_size_t buf_len = (op->length < *tlen - tpos
@@ -711,7 +679,7 @@ svn_txdelta_apply_instructions(svn_txdel
/* Copy from source area. */
assert(sbuf);
assert(op->offset + op->length <= window->sview_len);
- fast_memcpy(tbuf + tpos, sbuf + op->offset, buf_len);
+ memcpy(tbuf + tpos, sbuf + op->offset, buf_len);
break;
case svn_txdelta_target:
@@ -728,9 +696,9 @@ svn_txdelta_apply_instructions(svn_txdel
case svn_txdelta_new:
/* Copy from window new area. */
assert(op->offset + op->length <= window->new_data->len);
- fast_memcpy(tbuf + tpos,
- window->new_data->data + op->offset,
- buf_len);
+ memcpy(tbuf + tpos,
+ window->new_data->data + op->offset,
+ buf_len);
break;
default: