mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-22 07:13:23 +02:00
Don't move parenthesized lines to the left, even if that means they flow past the right margin. By default, BSD indent lines up statement continuation lines that are within parentheses so that they start just to the right of the preceding left parenthesis. However, traditionally, if that resulted in the continuation line extending to the right of the desired right margin, then indent would push it left just far enough to not overrun the margin, if it could do so without making the continuation line start to the left of the current statement indent. That makes for a weird mix of indentations unless one has been completely rigid about never violating the 80-column limit. This behavior has been pretty universally panned by Postgres developers. Hence, disable it with indent's new -lpl switch, so that parenthesized lines are always lined up with the preceding left paren. This patch is much less interesting than the first round of indent changes, but also bulkier, so I thought it best to separate the effects. Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
207 lines
5.6 KiB
C
207 lines
5.6 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* pg_prewarm.c
|
|
* prewarming utilities
|
|
*
|
|
* Copyright (c) 2010-2017, PostgreSQL Global Development Group
|
|
*
|
|
* IDENTIFICATION
|
|
* contrib/pg_prewarm/pg_prewarm.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
#include "access/heapam.h"
|
|
#include "catalog/catalog.h"
|
|
#include "fmgr.h"
|
|
#include "miscadmin.h"
|
|
#include "storage/bufmgr.h"
|
|
#include "storage/smgr.h"
|
|
#include "utils/acl.h"
|
|
#include "utils/builtins.h"
|
|
#include "utils/lsyscache.h"
|
|
#include "utils/rel.h"
|
|
|
|
PG_MODULE_MAGIC;
|
|
|
|
PG_FUNCTION_INFO_V1(pg_prewarm);
|
|
|
|
typedef enum
|
|
{
|
|
PREWARM_PREFETCH,
|
|
PREWARM_READ,
|
|
PREWARM_BUFFER
|
|
} PrewarmType;
|
|
|
|
static char blockbuffer[BLCKSZ];
|
|
|
|
/*
|
|
* pg_prewarm(regclass, mode text, fork text,
|
|
* first_block int8, last_block int8)
|
|
*
|
|
* The first argument is the relation to be prewarmed; the second controls
|
|
* how prewarming is done; legal options are 'prefetch', 'read', and 'buffer'.
|
|
* The third is the name of the relation fork to be prewarmed. The fourth
|
|
* and fifth arguments specify the first and last block to be prewarmed.
|
|
* If the fourth argument is NULL, it will be taken as 0; if the fifth argument
|
|
* is NULL, it will be taken as the number of blocks in the relation. The
|
|
* return value is the number of blocks successfully prewarmed.
|
|
*/
|
|
Datum
|
|
pg_prewarm(PG_FUNCTION_ARGS)
|
|
{
|
|
Oid relOid;
|
|
text *forkName;
|
|
text *type;
|
|
int64 first_block;
|
|
int64 last_block;
|
|
int64 nblocks;
|
|
int64 blocks_done = 0;
|
|
int64 block;
|
|
Relation rel;
|
|
ForkNumber forkNumber;
|
|
char *forkString;
|
|
char *ttype;
|
|
PrewarmType ptype;
|
|
AclResult aclresult;
|
|
|
|
/* Basic sanity checking. */
|
|
if (PG_ARGISNULL(0))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("relation cannot be null")));
|
|
relOid = PG_GETARG_OID(0);
|
|
if (PG_ARGISNULL(1))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
(errmsg("prewarm type cannot be null"))));
|
|
type = PG_GETARG_TEXT_PP(1);
|
|
ttype = text_to_cstring(type);
|
|
if (strcmp(ttype, "prefetch") == 0)
|
|
ptype = PREWARM_PREFETCH;
|
|
else if (strcmp(ttype, "read") == 0)
|
|
ptype = PREWARM_READ;
|
|
else if (strcmp(ttype, "buffer") == 0)
|
|
ptype = PREWARM_BUFFER;
|
|
else
|
|
{
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("invalid prewarm type"),
|
|
errhint("Valid prewarm types are \"prefetch\", \"read\", and \"buffer\".")));
|
|
PG_RETURN_INT64(0); /* Placate compiler. */
|
|
}
|
|
if (PG_ARGISNULL(2))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
(errmsg("relation fork cannot be null"))));
|
|
forkName = PG_GETARG_TEXT_PP(2);
|
|
forkString = text_to_cstring(forkName);
|
|
forkNumber = forkname_to_number(forkString);
|
|
|
|
/* Open relation and check privileges. */
|
|
rel = relation_open(relOid, AccessShareLock);
|
|
aclresult = pg_class_aclcheck(relOid, GetUserId(), ACL_SELECT);
|
|
if (aclresult != ACLCHECK_OK)
|
|
aclcheck_error(aclresult, ACL_KIND_CLASS, get_rel_name(relOid));
|
|
|
|
/* Check that the fork exists. */
|
|
RelationOpenSmgr(rel);
|
|
if (!smgrexists(rel->rd_smgr, forkNumber))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("fork \"%s\" does not exist for this relation",
|
|
forkString)));
|
|
|
|
/* Validate block numbers, or handle nulls. */
|
|
nblocks = RelationGetNumberOfBlocksInFork(rel, forkNumber);
|
|
if (PG_ARGISNULL(3))
|
|
first_block = 0;
|
|
else
|
|
{
|
|
first_block = PG_GETARG_INT64(3);
|
|
if (first_block < 0 || first_block >= nblocks)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("starting block number must be between 0 and " INT64_FORMAT,
|
|
nblocks - 1)));
|
|
}
|
|
if (PG_ARGISNULL(4))
|
|
last_block = nblocks - 1;
|
|
else
|
|
{
|
|
last_block = PG_GETARG_INT64(4);
|
|
if (last_block < 0 || last_block >= nblocks)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("ending block number must be between 0 and " INT64_FORMAT,
|
|
nblocks - 1)));
|
|
}
|
|
|
|
/* Now we're ready to do the real work. */
|
|
if (ptype == PREWARM_PREFETCH)
|
|
{
|
|
#ifdef USE_PREFETCH
|
|
|
|
/*
|
|
* In prefetch mode, we just hint the OS to read the blocks, but we
|
|
* don't know whether it really does it, and we don't wait for it to
|
|
* finish.
|
|
*
|
|
* It would probably be better to pass our prefetch requests in chunks
|
|
* of a megabyte or maybe even a whole segment at a time, but there's
|
|
* no practical way to do that at present without a gross modularity
|
|
* violation, so we just do this.
|
|
*/
|
|
for (block = first_block; block <= last_block; ++block)
|
|
{
|
|
CHECK_FOR_INTERRUPTS();
|
|
PrefetchBuffer(rel, forkNumber, block);
|
|
++blocks_done;
|
|
}
|
|
#else
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("prefetch is not supported by this build")));
|
|
#endif
|
|
}
|
|
else if (ptype == PREWARM_READ)
|
|
{
|
|
/*
|
|
* In read mode, we actually read the blocks, but not into shared
|
|
* buffers. This is more portable than prefetch mode (it works
|
|
* everywhere) and is synchronous.
|
|
*/
|
|
for (block = first_block; block <= last_block; ++block)
|
|
{
|
|
CHECK_FOR_INTERRUPTS();
|
|
smgrread(rel->rd_smgr, forkNumber, block, blockbuffer);
|
|
++blocks_done;
|
|
}
|
|
}
|
|
else if (ptype == PREWARM_BUFFER)
|
|
{
|
|
/*
|
|
* In buffer mode, we actually pull the data into shared_buffers.
|
|
*/
|
|
for (block = first_block; block <= last_block; ++block)
|
|
{
|
|
Buffer buf;
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
buf = ReadBufferExtended(rel, forkNumber, block, RBM_NORMAL, NULL);
|
|
ReleaseBuffer(buf);
|
|
++blocks_done;
|
|
}
|
|
}
|
|
|
|
/* Close relation, release lock. */
|
|
relation_close(rel, AccessShareLock);
|
|
|
|
PG_RETURN_INT64(blocks_done);
|
|
}
|