[PATCH 0/2 v6] printk, Add monotonic and real printk timestamps

From: Prarit Bhargava <prarit@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Prarit Bhargava <prarit@redhat.com>,
	Petr Mladek <pmladek@suse.com>,
	John Stultz <john.stultz@linaro.org>,
	Xunlei Pang <pang.xunlei@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Baolin Wang <baolin.wang@linaro.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Petr Mladek <pmladek@suse.cz>, Tejun Heo <tj@kernel.org>,
	Peter Hurley <peter@hurleysoftware.com>,
	Vasily Averin <vvs@virtuozzo.com>, Joe Perches <joe@perches.com>
Subject: [PATCH 0/2 v6] printk, Add monotonic and real printk timestamps
Date: Tue, 23 Feb 2016 12:53:58 -0500	[thread overview]
Message-ID: <1456250040-22351-1-git-send-email-prarit@redhat.com> (raw)

This patchset adds monotonic and real printk timestamps.  The first patch
changes CONFIG_PRINT_TIME from a bool to an int to allow for the additional
timestamps that are added in patch 2.

Changes from v6: Petr Mladek pointed out that the current patch
fails to indicate to userspace programs which timestamp is being used.
Additionally he pointed out that no other config option uses a mix of bool and
integers the way CONFIG_PRINTK_TIME would have done after my patch.  This
results in a patch to modify CONFIG_PRINTK_TIME to switch to int (which
includes modifications to config files) and a second patch to
implement the new timestamps.

Additionally, while testing the dmesg utility I noticed a difference in
behaviour between the old CONFIG_PRINTK_TIME=n and CONFIG_PRINTK_TIME=0
(both of which disabled timestamp on the console).  In the new case
the dmesg output always included 0.000000 timestamp instead of the actual time.
I have fixed this by recording (but not writing to the console) the timestamp
for 0 and 1 in printk_get_ts() so that dmesg behaves as before.

Cc: Petr Mladek <pmladek@suse.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Xunlei Pang <pang.xunlei@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Baolin Wang <baolin.wang@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Petr Mladek <pmladek@suse.cz>
Cc: Tejun Heo <tj@kernel.org>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Vasily Averin <vvs@virtuozzo.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>

Prarit Bhargava (2):
  lib, switch CONFIG_PRINTK_TIME to int
  printk, allow different timestamps for printk.time

 Documentation/kernel-parameters.txt                |  6 +-
 arch/arm/configs/axm55xx_defconfig                 |  2 +-
 arch/arm/configs/bcm2835_defconfig                 |  2 +-
 arch/arm/configs/bcm_defconfig                     |  2 +-
 arch/arm/configs/colibri_pxa270_defconfig          |  2 +-
 arch/arm/configs/colibri_pxa300_defconfig          |  2 +-
 arch/arm/configs/dove_defconfig                    |  2 +-
 arch/arm/configs/efm32_defconfig                   |  2 +-
 arch/arm/configs/exynos_defconfig                  |  2 +-
 arch/arm/configs/ezx_defconfig                     |  2 +-
 arch/arm/configs/h5000_defconfig                   |  2 +-
 arch/arm/configs/hisi_defconfig                    |  2 +-
 arch/arm/configs/imote2_defconfig                  |  2 +-
 arch/arm/configs/imx_v6_v7_defconfig               |  2 +-
 arch/arm/configs/keystone_defconfig                |  2 +-
 arch/arm/configs/lpc18xx_defconfig                 |  2 +-
 arch/arm/configs/magician_defconfig                |  2 +-
 arch/arm/configs/mmp2_defconfig                    |  2 +-
 arch/arm/configs/moxart_defconfig                  |  2 +-
 arch/arm/configs/multi_v7_defconfig                |  2 +-
 arch/arm/configs/mvebu_v7_defconfig                |  2 +-
 arch/arm/configs/mxs_defconfig                     |  2 +-
 arch/arm/configs/omap2plus_defconfig               |  2 +-
 arch/arm/configs/pxa168_defconfig                  |  2 +-
 arch/arm/configs/pxa3xx_defconfig                  |  2 +-
 arch/arm/configs/pxa910_defconfig                  |  2 +-
 arch/arm/configs/pxa_defconfig                     |  2 +-
 arch/arm/configs/qcom_defconfig                    |  2 +-
 arch/arm/configs/raumfeld_defconfig                |  2 +-
 arch/arm/configs/shmobile_defconfig                |  2 +-
 arch/arm/configs/socfpga_defconfig                 |  2 +-
 arch/arm/configs/stm32_defconfig                   |  2 +-
 arch/arm/configs/sunxi_defconfig                   |  2 +-
 arch/arm/configs/tegra_defconfig                   |  2 +-
 arch/arm/configs/u300_defconfig                    |  2 +-
 arch/arm/configs/u8500_defconfig                   |  2 +-
 arch/arm/configs/vt8500_v6_v7_defconfig            |  2 +-
 arch/arm/configs/xcep_defconfig                    |  2 +-
 arch/arm/configs/zx_defconfig                      |  2 +-
 arch/arm64/configs/defconfig                       |  2 +-
 arch/mips/configs/bcm47xx_defconfig                |  2 +-
 arch/mips/configs/bmips_be_defconfig               |  2 +-
 arch/mips/configs/bmips_stb_defconfig              |  2 +-
 arch/mips/configs/ci20_defconfig                   |  2 +-
 arch/mips/configs/lemote2f_defconfig               |  2 +-
 arch/mips/configs/loongson3_defconfig              |  2 +-
 arch/mips/configs/nlm_xlp_defconfig                |  2 +-
 arch/mips/configs/nlm_xlr_defconfig                |  2 +-
 arch/mips/configs/pistachio_defconfig              |  2 +-
 arch/mips/configs/qi_lb60_defconfig                |  2 +-
 arch/mips/configs/rt305x_defconfig                 |  2 +-
 arch/mips/configs/xway_defconfig                   |  2 +-
 arch/parisc/configs/generic-64bit_defconfig        |  2 +-
 arch/powerpc/configs/40x/virtex_defconfig          |  2 +-
 arch/powerpc/configs/44x/virtex5_defconfig         |  2 +-
 arch/powerpc/configs/44x/warp_defconfig            |  2 +-
 arch/powerpc/configs/52xx/cm5200_defconfig         |  2 +-
 arch/powerpc/configs/52xx/lite5200b_defconfig      |  2 +-
 arch/powerpc/configs/52xx/motionpro_defconfig      |  2 +-
 arch/powerpc/configs/52xx/tqm5200_defconfig        |  2 +-
 arch/powerpc/configs/gamecube_defconfig            |  2 +-
 arch/powerpc/configs/mpc5200_defconfig             |  2 +-
 arch/powerpc/configs/pasemi_defconfig              |  2 +-
 arch/powerpc/configs/wii_defconfig                 |  2 +-
 arch/s390/configs/default_defconfig                |  2 +-
 arch/s390/configs/gcov_defconfig                   |  2 +-
 arch/s390/configs/performance_defconfig            |  2 +-
 arch/s390/configs/zfcpdump_defconfig               |  2 +-
 arch/sh/configs/edosk7760_defconfig                |  2 +-
 arch/sh/configs/sdk7786_defconfig                  |  2 +-
 arch/sh/configs/se7722_defconfig                   |  2 +-
 arch/sh/configs/sh7785lcr_32bit_defconfig          |  2 +-
 arch/sh/configs/urquell_defconfig                  |  2 +-
 arch/sparc/configs/sparc64_defconfig               |  2 +-
 arch/x86/configs/i386_defconfig                    |  2 +-
 arch/x86/configs/x86_64_defconfig                  |  2 +-
 arch/xtensa/configs/audio_kc705_defconfig          |  2 +-
 arch/xtensa/configs/generic_kc705_defconfig        |  2 +-
 arch/xtensa/configs/nommu_kc705_defconfig          |  2 +-
 arch/xtensa/configs/smp_lx200_defconfig            |  2 +-
 include/linux/timekeeping.h                        |  1 +
 kernel/printk/printk.c                             | 76 ++++++++++++++++++++--
 kernel/time/timekeeping.c                          | 13 ++++
 lib/Kconfig.debug                                  |  8 ++-
 .../selftests/rcutorture/configs/lock/CFcommon     |  2 +-
 .../selftests/rcutorture/configs/rcu/CFcommon      |  2 +-
 86 files changed, 177 insertions(+), 89 deletions(-)

-- 
1.8.3.1