From: "Pan, Harry" <harry.pan@intel.com>
To: "rjw@rjwysocki.net" <rjw@rjwysocki.net>
Cc: "Brown, Len" <len.brown@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"gs0622@gmail.com" <gs0622@gmail.com>,
"pavel@ucw.cz" <pavel@ucw.cz>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: Re: [PATCH v3] PM / suspend: measure the time of filesystem syncing
Date: Wed, 20 Feb 2019 16:44:02 +0000 [thread overview]
Message-ID: <cf6926800899354808143bd48b4f943629c8cbe7.camel@intel.com> (raw)
In-Reply-To: <2819109.DzhZvocLkm@aspire.rjw.lan>
Thanks for comments.
> > + if (!IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC)) {
> > + ktime_t start;
> > + unsigned int elapsed_msecs;
> > +
> > + trace_suspend_resume(TPS("sync_filesystems"), 0, true);
> > + pr_info("Syncing filesystems ... ");
> > + start = ktime_get();
> > + ksys_sync();
> > + elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(),
> > start));
> > + pr_cont("(elapsed %d.%03d seconds) done.\n",
> > + elapsed_msecs / MSEC_PER_SEC,
> > + elapsed_msecs % MSEC_PER_SEC);
>
> One more nit.
>
> Since you are printing the sync time anyway, there is a little sense
> to
> split the message using pr_cont() that may be messed up with by any
> intervening messages, so why don't you just print a one-line
> pr_info("Filesystems sync: %d.%03d seconds\n", ...) message?
>
Yes, I agree.
In practical, I did see intervening messages (between pr_info and
pr_cont) when it came to long sync in kernel.
I was hesitated in this considering not fully understanding the
backdrop of split messages using pr_info() then pr_cont().
> Also, if you change it here, I guess it would be consistent to make
> an analogous change for hibernation.
One potential last-mile need your wisdom, which is about the switch
case of SNAPSHOT_FREEZE of the userspace interface you wrote.
I am yet to touch it, nor understand how to validate it.
That said, I am digesting your documents and source; I used the pm_test
from the doc to validate the patch on hibernation partially even non of
my handy laptons fully work well on it.
Sincerely,
Harry
next prev parent reply other threads:[~2019-02-20 16:44 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-03 5:20 [PATCH] PM / suspend: measure the time of filesystem syncing Harry Pan
2019-02-05 11:55 ` Rafael J. Wysocki
2019-02-06 14:52 ` Pan, Harry
2019-02-05 21:23 ` Pavel Machek
2019-02-06 15:08 ` Pan, Harry
2019-02-06 15:31 ` Pan, Harry
2019-02-06 16:16 ` Pavel Machek
2019-02-12 0:40 ` Pan, Harry
2019-02-06 14:42 ` Harry Pan
2019-02-06 14:53 ` Pavel Machek
2019-02-12 23:21 ` Rafael J. Wysocki
2019-02-12 23:26 ` Rafael J. Wysocki
2019-02-12 23:35 ` Rafael J. Wysocki
2019-02-06 15:42 ` [PATCH v2] " Harry Pan
2019-02-14 7:16 ` [PATCH v3] " Harry Pan
2019-02-14 11:15 ` Harry Pan
2019-02-19 10:24 ` Rafael J. Wysocki
2019-02-20 16:44 ` Pan, Harry [this message]
2019-02-20 21:45 ` Rafael J. Wysocki
2019-02-22 15:56 ` Pan, Harry
2019-02-20 16:12 ` [PATCH v4] " Harry Pan
2019-02-20 16:18 ` Harry Pan
2019-02-22 14:54 ` [PATCH v5] PM / sleep: " Harry Pan
2019-02-24 19:37 ` kbuild test robot
2019-02-24 23:23 ` kbuild test robot
2019-02-22 15:49 ` Harry Pan
2019-02-22 17:54 ` Pavel Machek
2019-02-24 6:17 ` [PATCH v6 1/2] PM / sleep: refactor the filesystems sync to reduce duplication Harry Pan
2019-02-24 6:17 ` [PATCH v6 2/2] PM / sleep: measure the time of filesystems syncing Harry Pan
2019-02-24 20:30 ` kbuild test robot
2019-02-24 21:51 ` kbuild test robot
2019-02-25 9:44 ` [PATCH v7 1/2] PM / sleep: refactor the filesystems sync to reduce duplication Harry Pan
2019-02-25 9:44 ` [PATCH v7 2/2] PM / sleep: measure the time of filesystems syncing Harry Pan
2019-02-25 12:36 ` [PATCH v7 1/2] PM / sleep: refactor the filesystems sync to reduce duplication Harry Pan
2019-02-25 12:36 ` [PATCH v7 2/2] PM / sleep: measure the time of filesystems syncing Harry Pan
2019-03-22 8:21 ` [PATCH v7 1/2] PM / sleep: refactor the filesystems sync to reduce duplication Pavel Machek
2019-02-25 7:33 ` [PATCH v5] PM / sleep: measure the time of filesystem syncing kbuild test robot
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