linux-kernel - Re: [PATCH v6 1/4] rcu: Make call

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Message-ID: <YzwafYASrgKZ24uq@pc636>
Date:   Tue, 4 Oct 2022 13:35:25 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Joel Fernandes <joel@...lfernandes.org>, paulmck@...nel.org,
        rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        rushikesh.s.kadam@...el.com, neeraj.iitr10@...il.com,
        frederic@...nel.org, rostedt@...dmis.org
Subject: Re: [PATCH v6 1/4] rcu: Make call_rcu() lazy to save power

> > >> 
> > >> OK. Found the boot up issue. In my case i had 120 seconds delay:
> > > 
> > > Wow, nice work.
> > > 
> > >> <snip>
> > >> diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
> > >> index 448748e3fba5..a56cfd612e3a 100644
> > >> --- a/drivers/scsi/scsi_error.c
> > >> +++ b/drivers/scsi/scsi_error.c
> > >> @@ -312,7 +312,7 @@ void scsi_eh_scmd_add(struct scsi_cmnd *scmd)
> > >>        * Ensure that all tasks observe the host state change before the
> > >>        * host_failed change.
> > >>        */
> > >> -       call_rcu(&scmd->rcu, scsi_eh_inc_host_failed);
> > >> +       call_rcu_flush(&scmd->rcu, scsi_eh_inc_host_failed);
> > > 
> > > Great! Thanks. I’ll include this and the other one you converted in the next revision.
> > 
> > By the way, any chance you could check android as well, just to rule out any trouble markers? ChromeOS and your Linux distro are doing well on boot so that’s a good sign.
> > 
> I will check v6 on Android. I will get back shortly.
> 
OK. Works and boots well. I do not see any issues with Android so far.

--
Uladzislau Rezki