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Refactor postmaster child process launching

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Introduce new postmaster_child_launch() function that deals with the
differences in EXEC_BACKEND mode.

Refactor the mechanism of passing information from the parent to child
process. Instead of using different command-line arguments when
launching the child process in EXEC_BACKEND mode, pass a
variable-length blob of startup data along with all the global
variables. The contents of that blob depend on the kind of child
process being launched. In !EXEC_BACKEND mode, we use the same blob,
but it's simply inherited from the parent to child process.

Reviewed-by: Tristan Partin, Andres Freund
Discussion: https://www.postgresql.org/message-id/7a59b073-5b5b-151e-7ed3-8b01ff7ce9ef@iki.fi
This commit is contained in:
Heikki Linnakangas
2024-03-18 11:35:08 +02:00
parent f1baed18bc
commit aafc05de1b
28 changed files with 676 additions and 1008 deletions
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53
src/backend/postmaster/auxprocess.c
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@@ -27,6 +27,7 @@
#include "storage/ipc.h"
#include "storage/proc.h"
#include "storage/procsignal.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
@@ -34,19 +35,22 @@ static void ShutdownAuxiliaryProcess(int code, Datum arg);
/*
* AuxiliaryProcessMain
* AuxiliaryProcessMainCommon
*
* The main entry point for auxiliary processes, such as the bgwriter,
* walwriter, walreceiver, bootstrapper and the shared memory checker code.
*
* This code is here just because of historical reasons.
* Common initialization code for auxiliary processes, such as the bgwriter,
* walwriter, walreceiver, and the startup process.
*/
void
AuxiliaryProcessMain(BackendType auxtype)
AuxiliaryProcessMainCommon(void)
{
Assert(IsUnderPostmaster);
MyBackendType = auxtype;
/* Release postmaster's working memory context */
if (PostmasterContext)
{
MemoryContextDelete(PostmasterContext);
PostmasterContext = NULL;
}
init_ps_display(NULL);
@@ -84,41 +88,6 @@ AuxiliaryProcessMain(BackendType auxtype)
before_shmem_exit(ShutdownAuxiliaryProcess, 0);
SetProcessingMode(NormalProcessing);
switch (MyBackendType)
{
case B_STARTUP:
StartupProcessMain();
proc_exit(1);
case B_ARCHIVER:
PgArchiverMain();
proc_exit(1);
case B_BG_WRITER:
BackgroundWriterMain();
proc_exit(1);
case B_CHECKPOINTER:
CheckpointerMain();
proc_exit(1);
case B_WAL_WRITER:
WalWriterMain();
proc_exit(1);
case B_WAL_RECEIVER:
WalReceiverMain();
proc_exit(1);
case B_WAL_SUMMARIZER:
WalSummarizerMain();
proc_exit(1);
default:
elog(PANIC, "unrecognized process type: %d", (int) MyBackendType);
proc_exit(1);
}
}
/*