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linux/kernel/sched
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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
sched/headers: Simplify and clean up header usage in the scheduler
2018-03-04 12:39:29 +01:00
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
sched/headers: Simplify and clean up header usage in the scheduler
2018-03-04 12:39:29 +01:00
cpudeadline.c
Merge tag 'v5.2-rc5' into sched/core, to pick up fixes
2019-06-17 12:12:27 +02:00
cpudeadline.h
sched/headers: Simplify and clean up header usage in the scheduler
2018-03-04 12:39:29 +01:00
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
sched/headers: Simplify and clean up header usage in the scheduler
2018-03-04 12:39:29 +01:00
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