Johannes Weiner 4e38135180 psi: Fix a division error in psi poll() ...

[ Upstream commit c3466952ca ]

The psi window size is a u64 an can be up to 10 seconds right now,
which exceeds the lower 32 bits of the variable. We currently use
div_u64 for it, which is meant only for 32-bit divisors. The result is
garbage pressure sampling values and even potential div0 crashes.

Use div64_u64.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Jingfeng Xie <xiejingfeng@linux.alibaba.com>
Link: https://lkml.kernel.org/r/20191203183524.41378-3-hannes@cmpxchg.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-01-12 12:21:36 +01:00

..

autogroup.c

sched/autogroup: Make autogroup_path() always available

2019-06-24 19:23:40 +02:00

autogroup.h

…

clock.c

treewide: Add SPDX license identifier for missed files

2019-05-21 10:50:45 +02:00

completion.c

sched/Documentation: Update wake_up() & co. memory-barrier guarantees

2018-07-17 09:30:34 +02:00

core.c

sched/uclamp: Fix overzealous type replacement

2019-12-31 16:45:37 +01:00

cpuacct.c

…

cpudeadline.c

Merge tag 'v5.2-rc5' into sched/core, to pick up fixes

2019-06-17 12:12:27 +02:00

cpudeadline.h

…

cpufreq_schedutil.c

cpufreq: Avoid leaving stale IRQ work items during CPU offline

2019-12-31 16:46:06 +01:00

cpufreq.c

cpufreq: Avoid leaving stale IRQ work items during CPU offline

2019-12-31 16:46:06 +01:00

cpupri.c

Merge tag 'v5.2-rc5' into sched/core, to pick up fixes

2019-06-17 12:12:27 +02:00

cpupri.h

…

cputime.c

sched/vtime: Fix guest/system mis-accounting on task switch

2019-10-09 12:38:03 +02:00

deadline.c

sched: Fix pick_next_task() vs 'change' pattern race

2019-11-08 22:34:14 +01:00

debug.c

Merge tag 'v5.2-rc6' into sched/core, to refresh the branch

2019-06-24 19:19:53 +02:00

fair.c

sched/pelt: Fix update of blocked PELT ordering

2019-11-13 08:01:31 +01:00

features.h

sched/fair: Replace source_load() & target_load() with weighted_cpuload()

2019-06-03 11:49:39 +02:00

idle.c

sched: Fix pick_next_task() vs 'change' pattern race

2019-11-08 22:34:14 +01:00

isolation.c

sched/isolation: Prefer housekeeping CPU in local node

2019-07-25 15:51:55 +02:00

loadavg.c

sched: loadavg: make calc_load_n() public

2018-10-26 16:26:32 -07:00

Makefile

psi: pressure stall information for CPU, memory, and IO

2018-10-26 16:26:32 -07:00

membarrier.c

membarrier: Fix RCU locking bug caused by faulty merge

2019-10-01 21:27:50 +02:00

pelt.c

sched/debug: Add new tracepoint to track PELT at se level

2019-06-24 19:23:42 +02:00

pelt.h

sched/topology: Remove unused 'sd' parameter from arch_scale_cpu_capacity()

2019-06-24 19:23:39 +02:00

psi.c

psi: Fix a division error in psi poll()

2020-01-12 12:21:36 +01:00

rt.c

sched: Fix pick_next_task() vs 'change' pattern race

2019-11-08 22:34:14 +01:00

sched-pelt.h

sched/fair: Fix "runnable_avg_yN_inv" not used warnings

2019-06-17 12:15:58 +02:00

sched.h

sched/uclamp: Fix overzealous type replacement

2019-12-31 16:45:37 +01:00

stats.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

stats.h

sched/stats: Fix unlikely() use of sched_info_on()

2019-07-25 15:51:55 +02:00

stop_task.c

sched: Fix pick_next_task() vs 'change' pattern race

2019-11-08 22:34:14 +01:00

swait.c

kernel/sched/: remove caller signal_pending branch predictions

2019-01-04 13:13:48 -08:00

topology.c

sched/topology: Allow sched_asym_cpucapacity to be disabled

2019-10-29 09:58:46 +01:00

wait_bit.c

treewide: Add SPDX license identifier for missed files

2019-05-21 10:50:45 +02:00

wait.c

sched/wait: Deduplicate code with do-while

2019-06-24 19:23:40 +02:00