Josh Snyder c96f5471ce delayacct: Account blkio completion on the correct task ... Before commit: e33a9bba85 ("sched/core: move IO scheduling accounting from io_schedule_timeout() into scheduler") delayacct_blkio_end() was called after context-switching into the task which completed I/O. This resulted in double counting: the task would account a delay both waiting for I/O and for time spent in the runqueue. With e33a9bba85, delayacct_blkio_end() is called by try_to_wake_up(). In ttwu, we have not yet context-switched. This is more correct, in that the delay accounting ends when the I/O is complete. But delayacct_blkio_end() relies on 'get_current()', and we have not yet context-switched into the task whose I/O completed. This results in the wrong task having its delay accounting statistics updated. Instead of doing that, pass the task_struct being woken to delayacct_blkio_end(), so that it can update the statistics of the correct task. Signed-off-by: Josh Snyder <joshs@netflix.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Balbir Singh <bsingharora@gmail.com> Cc: <stable@vger.kernel.org> Cc: Brendan Gregg <bgregg@netflix.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-block@vger.kernel.org Fixes: e33a9bba85 ("sched/core: move IO scheduling accounting from io_schedule_timeout() into scheduler") Link: http://lkml.kernel.org/r/1513613712-571-1-git-send-email-joshs@netflix.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2018-01-16 03:29:36 +01:00
..
acpi	Merge branch 'acpi-ec' into acpi	2017-11-30 13:37:29 +01:00
asm-generic	Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-12-23 11:53:04 -08:00
clocksource
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2018-01-05 12:10:06 -08:00
drm	drm: rework delayed connector cleanup in connector_iter	2017-12-13 22:59:00 +01:00
dt-bindings	fixes/cleanups for rc1, non-desktop flags for VR	2017-11-23 21:04:56 -10:00
keys
kvm	KVM: arm/arm64: timer: Don't set irq as forwarded if no usable GIC	2017-12-18 10:53:23 +01:00
linux	delayacct: Account blkio completion on the correct task	2018-01-16 03:29:36 +01:00
math-emu
media	media updates for v4.15-rc1	2017-11-15 20:30:12 -08:00
memory
misc
net	sctp: fix the handling of ICMP Frag Needed for too small MTUs	2018-01-08 14:19:13 -05:00
pcmcia
ras
rdma
scsi	scsi: libsas: align sata_device's rps_resp on a cacheline	2017-11-21 23:06:32 -05:00
soc	We have two changes to the core framework this time around. The first being a	2017-11-17 20:04:24 -08:00
sound	ALSA: hda - Fix yet remaining issue with vmaster 0dB initialization	2017-11-22 12:34:56 +01:00
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2017-11-24 19:19:20 -10:00
trace	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-12-28 23:20:21 -08:00
uapi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf	2018-01-05 10:33:01 -05:00
video	fbdev changes for v4.15:	2017-11-20 21:50:24 -10:00
xen	xen: fixes for 4.15-rc5	2017-12-22 12:30:10 -08:00