rust/neon
1
0
Fork 0
mirror of https://github.com/neondatabase/neon.git synced 2025-12-22 21:59:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

compute/lfc: Add chunk size to neon_lfc_stats (#11100)

Browse Source 
This PR adds a new key to neon.neon_lfc_stats —
'file_cache_chunk_size_pages'. It just returns the value of
BLOCKS_PER_CHUNK from the LFC implementation.

The new value should (eventually) allow changing the chunk size without
breaking any places that rely on LFC stats values measured in number of
chunks.

See neondatabase/cloud#25170 for more.
This commit is contained in:
Em Sharnoff
2025-03-05 12:35:08 -08:00
committed by GitHub
parent 604eb5e8d4
commit 1fe23fe8d2
4 changed files with 16 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
compute/etc/neon_collector.jsonnet
View File

@@ -29,6 +29,7 @@
import 'sql_exporter/lfc_approximate_working_set_size.libsonnet',
import 'sql_exporter/lfc_approximate_working_set_size_windows.libsonnet',
import 'sql_exporter/lfc_cache_size_limit.libsonnet',
import 'sql_exporter/lfc_chunk_size.libsonnet',
import 'sql_exporter/lfc_hits.libsonnet',
import 'sql_exporter/lfc_misses.libsonnet',
import 'sql_exporter/lfc_used.libsonnet',

10
compute/etc/sql_exporter/lfc_chunk_size.libsonnet Normal file
View File

@@ -0,0 +1,10 @@
{
metric_name: 'lfc_chunk_size',
type: 'gauge',
help: 'LFC chunk size, measured in 8KiB pages',
key_labels: null,
values: [
'lfc_chunk_size_pages',
],
query: importstr 'sql_exporter/lfc_chunk_size.sql',
}

1
compute/etc/sql_exporter/lfc_chunk_size.sql Normal file
View File

@@ -0,0 +1 @@
SELECT lfc_value AS lfc_chunk_size_pages FROM neon.neon_lfc_stats WHERE lfc_key = 'file_cache_chunk_size_pages';

4
pgxn/neon/file_cache.c
View File

@@ -1369,6 +1369,10 @@ neon_get_lfc_stats(PG_FUNCTION_ARGS)
if (lfc_ctl)
value = lfc_ctl->limit;
break;
case 8:
key = "file_cache_chunk_size_pages";
value = BLOCKS_PER_CHUNK;
break;
default:
SRF_RETURN_DONE(funcctx);
}