lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20190224061753.17638-2-harry.pan@intel.com>
Date:   Sun, 24 Feb 2019 14:17:54 +0800
From:   Harry Pan <harry.pan@...el.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     harry.pan@...el.com, gs0622@...il.com, rjw@...ysocki.net,
        pavel@....cz, len.brown@...el.com, linux-pm@...r.kernel.org
Subject: [PATCH v6 2/2] PM / sleep: measure the time of filesystems syncing

This patch gives the reader an intuitive metric of the time cost by
the kernel issuing filesystems sync during system sleep; although
developer can guess by the timestamp of next log or enable the ftrace
power event for manual calculation, this manner is easier to read and
benefits the automation script.

Signed-off-by: Harry Pan <harry.pan@...el.com>
---
 kernel/power/main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/power/main.c b/kernel/power/main.c
index a8a8e6ec57e6..a08dcc743f31 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -54,9 +54,15 @@ EXPORT_SYMBOL_GPL(unlock_system_sleep);
 
 void ksys_sync_helper(void)
 {
-	pr_info("Syncing filesystems ... ");
+	ktime_t start;
+	s64 elapsed_msecs;
+
+	start = ktime_get();
 	ksys_sync();
-	pr_cont("done.\n");
+	elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start));
+	pr_info("Filesystems sync: %lld.%03lld seconds\n",
+		elapsed_msecs / MSEC_PER_SEC,
+		elapsed_msecs % MSEC_PER_SEC);
 }
 EXPORT_SYMBOL_GPL(ksys_sync_helper);
 
-- 
2.18.1

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ