From: | vignesh C <vignesh21(at)gmail(dot)com> |
---|---|
To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Printing backtrace of postgres processes |
Date: | 2021-01-16 17:34:52 |
Message-ID: | CALDaNm2wjFrizmy+yvNbedYKxorZBcGYXNMaoPC6zwSaLsmwLg@mail.gmail.com |
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Lists: | pgsql-hackers |
On Sat, Jan 16, 2021 at 1:40 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
>
> On 2021-01-15 09:53:05 +0100, Peter Eisentraut wrote:
> > On 2020-12-08 10:38, vignesh C wrote:
> > > I have implemented printing of backtrace based on handling it in
> > > CHECK_FOR_INTERRUPTS. This patch also includes the change to allow
> > > getting backtrace of any particular process based on the suggestions.
> > > Attached patch has the implementation for the same.
> > > Thoughts?
> >
> > Are we willing to use up a signal for this?
>
> Why is a full signal needed? Seems the procsignal infrastructure should
> suffice?
Most of the processes have access to ProcSignal, for these processes
printing of callstack signal was handled by using ProcSignal. Pgstat
process & syslogger process do not have access to ProcSignal,
multiplexing with SIGUSR1 is not possible for these processes. So I
handled the printing of callstack for pgstat process & syslogger using
the SIGUSR2 signal.
This is because shared memory is detached before pgstat & syslogger
process is started by using the below:
/* Drop our connection to postmaster's shared memory, as well */
dsm_detach_all();
PGSharedMemoryDetach();
Regards,
Vignesh
EnterpriseDB: http://www.enterprisedb.com
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