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Fix caclulation of prefetch ring position to fit in-flight request in resized ring buffer (#10899)

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## Problem

Refer https://github.com/neondatabase/neon/issues/10885

Wait position in ring buffer to restrict number of in-flight requests is
not correctly calculated.

## Summary of changes

Update condition and remove redundant assertion

Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>
This commit is contained in:
Konstantin Knizhnik
2025-02-20 22:21:44 +02:00
committed by GitHub
parent 3f376e44ba
commit 0b9b391ea0
1 changed files with 1 additions and 2 deletions
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3
pgxn/neon/pagestore_smgr.c
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@@ -474,8 +474,7 @@ readahead_buffer_resize(int newsize, void *extra)
*/
if (MyPState->n_requests_inflight > newsize)
{
Assert(MyPState->ring_unused >= MyPState->n_requests_inflight - newsize);
prefetch_wait_for(MyPState->ring_unused - (MyPState->n_requests_inflight - newsize));
prefetch_wait_for(MyPState->ring_unused - newsize - 1);
Assert(MyPState->n_requests_inflight <= newsize);
}