From 5a3423ad8ee171fbf08317917981effe47d211eb Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: Fri, 8 Sep 2023 15:05:12 +0200
Subject: Add JIT deform_counter

generation_counter includes time spent on both JIT:ing expressions
and tuple deforming which are configured independently via options
jit_expressions and jit_tuple_deforming.  As they are  combined in
the same counter it's not apparent what fraction of time the tuple
deforming takes.

This adds deform_counter dedicated to tuple deforming, which allows
seeing more directly the influence jit_tuple_deforming is having on
the query. The counter is exposed in EXPLAIN and pg_stat_statements
bumpin pg_stat_statements to 1.11.

Author: Dmitry Dolgov <9erthalion6@gmail.com>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/20220612091253.eegstkufdsu4kfls@erthalion.local
---
 doc/src/sgml/jit.sgml              |  2 +-
 doc/src/sgml/pgstatstatements.sgml | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/jit.sgml b/doc/src/sgml/jit.sgml
index 998c972e8ba..1921557cb82 100644
--- a/doc/src/sgml/jit.sgml
+++ b/doc/src/sgml/jit.sgml
@@ -170,7 +170,7 @@ SET
  JIT:
    Functions: 3
    Options: Inlining false, Optimization false, Expressions true, Deforming true
-   Timing: Generation 1.259 ms, Inlining 0.000 ms, Optimization 0.797 ms, Emission 5.048 ms, Total 7.104 ms
+   Timing: Generation 1.259 ms (Deform 0.000 ms), Inlining 0.000 ms, Optimization 0.797 ms, Emission 5.048 ms, Total 7.104 ms
  Execution Time: 7.416 ms
 </screen>
    As visible here, <acronym>JIT</acronym> was used, but inlining and
diff --git a/doc/src/sgml/pgstatstatements.sgml b/doc/src/sgml/pgstatstatements.sgml
index b1214ee6453..7e7c5c9ff82 100644
--- a/doc/src/sgml/pgstatstatements.sgml
+++ b/doc/src/sgml/pgstatstatements.sgml
@@ -420,6 +420,25 @@
       </para></entry>
      </row>
 
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>jit_deform_count</structfield> <type>bigint</type>
+      </para>
+      <para>
+       Total number of tuple deform functions JIT-compiled by the statement
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>jit_deform_time</structfield> <type>double precision</type>
+      </para>
+      <para>
+        Total time spent by the statement on JIT-compiling tuple deform
+        functions, in milliseconds
+      </para></entry>
+     </row>
+
      <row>
       <entry role="catalog_table_entry"><para role="column_definition">
        <structfield>jit_inlining_count</structfield> <type>bigint</type>
-- 
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