After enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),
2-core 2-thread-per-core interAptiv (CPS-driven) started emitting
the following:
[ 0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))
[ 0.048183] ------------[ cut here ]------------
[ 0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240
[ 0.048220] Modules linked in:
[ 0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f
[ 0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1
[ 0.048278] 830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000
[ 0.048307] 00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000
[ 0.048334] 00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34
[ 0.048361] 817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933
[ 0.048389] ...
[ 0.048396] Call Trace:
[ 0.048399] [<8105a7bc>] show_stack+0x3c/0x140
[ 0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80
[ 0.048440] [<8108b5c0>] __warn+0xc0/0xf4
[ 0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c
[ 0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240
[ 0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80
[ 0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140
[ 0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140
[ 0.048523] [<8106593c>] start_secondary+0xbc/0x280
[ 0.048539]
[ 0.048543] ---[ end trace 0000000000000000 ]---
[ 0.048636] Synchronize counters for CPU 1: done.
...for each but CPU 0/boot.
Basic debug printks right before the mentioned line say:
[ 0.048170] CPU: 1, smt_mask:
So smt_mask, which is sibling mask obviously, is empty when entering
the function.
This is critical, as sched_core_cpu_starting() calculates
core-scheduling parameters only once per CPU start, and it's crucial
to have all the parameters filled in at that moment (at least it
uses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on
MIPS).
A bit of debugging led me to that set_cpu_sibling_map() performing
the actual map calculation, was being invocated after
notify_cpu_start(), and exactly the latter function starts CPU HP
callback round (sched_core_cpu_starting() is basically a CPU HP
callback).
While the flow is same on ARM64 (maps after the notifier, although
before calling set_cpu_online()), x86 started calculating sibling
maps earlier than starting the CPU HP callbacks in Linux 4.14 (see
[0] for the reference). Neither me nor my brief tests couldn't find
any potential caveats in calculating the maps right after performing
delay calibration, but the WARN splat is now gone.
The very same debug prints now yield exactly what I expected from
them:
[ 0.048433] CPU: 1, smt_mask: 0-1
[0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef
Signed-off-by: Alexander Lobakin <[email protected]>
---
arch/mips/kernel/smp.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index d542fb7af3ba..1986d1309410 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -351,6 +351,9 @@ asmlinkage void start_secondary(void)
cpu = smp_processor_id();
cpu_data[cpu].udelay_val = loops_per_jiffy;
+ set_cpu_sibling_map(cpu);
+ set_cpu_core_map(cpu);
+
cpumask_set_cpu(cpu, &cpu_coherent_mask);
notify_cpu_starting(cpu);
@@ -362,9 +365,6 @@ asmlinkage void start_secondary(void)
/* The CPU is running and counters synchronised, now mark it online */
set_cpu_online(cpu, true);
- set_cpu_sibling_map(cpu);
- set_cpu_core_map(cpu);
-
calculate_cpu_foreign_map();
/*
--
2.35.1
On 12/2/22 23:21, Alexander Lobakin wrote:
> After enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),
> 2-core 2-thread-per-core interAptiv (CPS-driven) started emitting
> the following:
>
> [ 0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))
> [ 0.048183] ------------[ cut here ]------------
> [ 0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240
> [ 0.048220] Modules linked in:
> [ 0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f
> [ 0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1
> [ 0.048278] 830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000
> [ 0.048307] 00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000
> [ 0.048334] 00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34
> [ 0.048361] 817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933
> [ 0.048389] ...
> [ 0.048396] Call Trace:
> [ 0.048399] [<8105a7bc>] show_stack+0x3c/0x140
> [ 0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80
> [ 0.048440] [<8108b5c0>] __warn+0xc0/0xf4
> [ 0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c
> [ 0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240
> [ 0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80
> [ 0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140
> [ 0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140
> [ 0.048523] [<8106593c>] start_secondary+0xbc/0x280
> [ 0.048539]
> [ 0.048543] ---[ end trace 0000000000000000 ]---
> [ 0.048636] Synchronize counters for CPU 1: done.
>
> ...for each but CPU 0/boot.
> Basic debug printks right before the mentioned line say:
>
> [ 0.048170] CPU: 1, smt_mask:
>
> So smt_mask, which is sibling mask obviously, is empty when entering
> the function.
> This is critical, as sched_core_cpu_starting() calculates
> core-scheduling parameters only once per CPU start, and it's crucial
> to have all the parameters filled in at that moment (at least it
> uses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on
> MIPS).
>
> A bit of debugging led me to that set_cpu_sibling_map() performing
> the actual map calculation, was being invocated after
> notify_cpu_start(), and exactly the latter function starts CPU HP
> callback round (sched_core_cpu_starting() is basically a CPU HP
> callback).
> While the flow is same on ARM64 (maps after the notifier, although
> before calling set_cpu_online()), x86 started calculating sibling
> maps earlier than starting the CPU HP callbacks in Linux 4.14 (see
> [0] for the reference). Neither me nor my brief tests couldn't find
> any potential caveats in calculating the maps right after performing
> delay calibration, but the WARN splat is now gone.
> The very same debug prints now yield exactly what I expected from
> them:
>
> [ 0.048433] CPU: 1, smt_mask: 0-1
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef
Isn't it worth Cc'ing [email protected] here?
> Signed-off-by: Alexander Lobakin <[email protected]>
> ---
> arch/mips/kernel/smp.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
On Sat, Feb 12, 2022 at 10:21:11PM +0000, Alexander Lobakin wrote:
> After enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),
> 2-core 2-thread-per-core interAptiv (CPS-driven) started emitting
> the following:
>
> [ 0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))
> [ 0.048183] ------------[ cut here ]------------
> [ 0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240
> [ 0.048220] Modules linked in:
> [ 0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f
> [ 0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1
> [ 0.048278] 830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000
> [ 0.048307] 00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000
> [ 0.048334] 00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34
> [ 0.048361] 817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933
> [ 0.048389] ...
> [ 0.048396] Call Trace:
> [ 0.048399] [<8105a7bc>] show_stack+0x3c/0x140
> [ 0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80
> [ 0.048440] [<8108b5c0>] __warn+0xc0/0xf4
> [ 0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c
> [ 0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240
> [ 0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80
> [ 0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140
> [ 0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140
> [ 0.048523] [<8106593c>] start_secondary+0xbc/0x280
> [ 0.048539]
> [ 0.048543] ---[ end trace 0000000000000000 ]---
> [ 0.048636] Synchronize counters for CPU 1: done.
>
> ...for each but CPU 0/boot.
> Basic debug printks right before the mentioned line say:
>
> [ 0.048170] CPU: 1, smt_mask:
>
> So smt_mask, which is sibling mask obviously, is empty when entering
> the function.
> This is critical, as sched_core_cpu_starting() calculates
> core-scheduling parameters only once per CPU start, and it's crucial
> to have all the parameters filled in at that moment (at least it
> uses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on
> MIPS).
>
> A bit of debugging led me to that set_cpu_sibling_map() performing
> the actual map calculation, was being invocated after
> notify_cpu_start(), and exactly the latter function starts CPU HP
> callback round (sched_core_cpu_starting() is basically a CPU HP
> callback).
> While the flow is same on ARM64 (maps after the notifier, although
> before calling set_cpu_online()), x86 started calculating sibling
> maps earlier than starting the CPU HP callbacks in Linux 4.14 (see
> [0] for the reference). Neither me nor my brief tests couldn't find
> any potential caveats in calculating the maps right after performing
> delay calibration, but the WARN splat is now gone.
> The very same debug prints now yield exactly what I expected from
> them:
>
> [ 0.048433] CPU: 1, smt_mask: 0-1
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef
>
> Signed-off-by: Alexander Lobakin <[email protected]>
> ---
> arch/mips/kernel/smp.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
> index d542fb7af3ba..1986d1309410 100644
> --- a/arch/mips/kernel/smp.c
> +++ b/arch/mips/kernel/smp.c
> @@ -351,6 +351,9 @@ asmlinkage void start_secondary(void)
> cpu = smp_processor_id();
> cpu_data[cpu].udelay_val = loops_per_jiffy;
>
> + set_cpu_sibling_map(cpu);
> + set_cpu_core_map(cpu);
> +
> cpumask_set_cpu(cpu, &cpu_coherent_mask);
> notify_cpu_starting(cpu);
>
> @@ -362,9 +365,6 @@ asmlinkage void start_secondary(void)
> /* The CPU is running and counters synchronised, now mark it online */
> set_cpu_online(cpu, true);
>
> - set_cpu_sibling_map(cpu);
> - set_cpu_core_map(cpu);
> -
> calculate_cpu_foreign_map();
>
> /*
> --
> 2.35.1
applied to mips-fixes.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]