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Commit59af8d4

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Pad XLogReaderState's per-buffer data_bufsz more aggressively.
Originally, we palloc'd this buffer just barely big enough to hold thelargest xlog backup block seen so far. We now MAXALIGN the palloc size.The original coding could result in many repeated palloc cycles, in theworst case where we see a series ofgradually larger xlog records. Weameliorate that similarly to8735978by imposing a minimum buffer size of BLCKSZ.Discussion:https://postgr.es/m/E1eHa4J-0006hI-Q8@gemulon.postgresql.org
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‎src/backend/access/transam/xlogreader.c

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1264,7 +1264,13 @@ DecodeXLogRecord(XLogReaderState *state, XLogRecord *record, char **errormsg)
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{
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if (blk->data)
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pfree(blk->data);
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blk->data_bufsz=blk->data_len;
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/*
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* Force the initial request to be BLCKSZ so that we don't
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* waste time with lots of trips through this stanza as a
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* result of WAL compression.
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*/
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blk->data_bufsz=MAXALIGN(Max(blk->data_len,BLCKSZ));
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blk->data=palloc(blk->data_bufsz);
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}
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memcpy(blk->data,ptr,blk->data_len);

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