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Improve error reporting for unsupported effective_io_concurrency setting.

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Give a specific error complaining about lack of posix_fadvise() when
someone tries to set effective_io_concurrency > 0 on platforms
without that.

This probably isn't worth extensive back-patching, but I (tgl) felt
cramming it into v11 was reasonable.

James Robinson

Discussion: https://postgr.es/m/153771876450.14994.560017943128223619@wrigleys.postgresql.org
Discussion: https://postgr.es/m/A3942987-5BC7-4F05-B54D-2A0EC2914B33@jlr-photo.com
This commit is contained in:
Tom Lane
2018-09-28 16:12:13 -04:00
parent 61f14cc8c8
commit 2b04dfc472
2 changed files with 11 additions and 3 deletions
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4
src/include/pg_config_manual.h
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@@ -136,7 +136,9 @@
/*
* USE_PREFETCH code should be compiled only if we have a way to implement
* prefetching. (This is decoupled from USE_POSIX_FADVISE because there
* might in future be support for alternative low-level prefetch APIs.)
* might in future be support for alternative low-level prefetch APIs.
* If you change this, you probably need to adjust the error message in
* check_effective_io_concurrency.)
*/
#ifdef USE_POSIX_FADVISE
#define USE_PREFETCH