lkml.org 
[lkml]   [2020]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 3/4] powercap/drivers/dtpm: Add API for dynamic thermal power management
From
Date

Hi Lukasz,

thanks for the review

On 10/11/2020 10:59, Lukasz Luba wrote:

[ ... ]

>> +/* Init section thermal table */
>> +extern struct dtpm_descr *__dtpm_table[];
>> +extern struct dtpm_descr *__dtpm_table_end[];
>> +
>> +#define DTPM_TABLE_ENTRY(name)            \
>> +    static typeof(name) *__dtpm_table_entry_##name    \
>> +    __used __section(__dtpm_table) = &name
>
> I had to change the section name to string, to pass compilation:
> __used __section("__dtpm_table") = &name
> I don't know if it's my compiler or configuration.

Actually, it is:

commit 33def8498fdde180023444b08e12b72a9efed41d
Author: Joe Perches <joe@perches.com>
Date: Wed Oct 21 19:36:07 2020 -0700

treewide: Convert macro and uses of __section(foo) to __section("foo")

Your change is correct, I've noticed it a few days ago when rebasing the
series.

> I've tried to register this DTPM in scmi-cpufreq.c with macro
> proposed in patch 4/4 commit message, but I might missed some
> important includes there...
>
>> +
>> +#define DTPM_DECLARE(name)    DTPM_TABLE_ENTRY(name)
>> +
>> +#define for_each_dtpm_table(__dtpm)    \
>> +    for (__dtpm = __dtpm_table;    \
>> +         __dtpm < __dtpm_table_end;    \
>> +         __dtpm++)
>> +
>> +static inline struct dtpm *to_dtpm(struct powercap_zone *zone)
>> +{
>> +    return container_of(zone, struct dtpm, zone);
>> +}
>> +
>> +int dtpm_update_power(struct dtpm *dtpm, u64 power_min, u64 power_max);
>> +
>> +int dtpm_release_zone(struct powercap_zone *pcz);
>> +
>> +struct dtpm *dtpm_alloc(void);
>> +
>> +void dtpm_unregister(struct dtpm *dtpm);
>> +
>> +int dtpm_register_parent(const char *name, struct dtpm *dtpm,
>> +             struct dtpm *parent);
>> +
>> +int dtpm_register(const char *name, struct dtpm *dtpm, struct dtpm
>> *parent,
>> +          struct powercap_zone_ops *ops, int nr_constraints,
>> +          struct powercap_zone_constraint_ops *const_ops);
>> +#endif
>>
>
> Minor comment. This new framework deserves more debug prints, especially
> in registration/unregistration paths. I had to put some, to test it.
> But it can be done later as well, after it gets into mainline.

Ok, I will add some debug traces.

> I have also run different hotplug stress tests to check this tree
> locking. The userspace process constantly reading these values, while
> the last CPU in the cluster was going on/off and node was detaching.
> I haven't seen any problems, but the tree wasn't so deep.
> Everything was calculated properly, no error, null pointers, etc.

Great! thank you very much for this test

> Apart from the spelling minor issues and the long constraint name, LGTM
>
> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
> Tested-by: Lukasz Luba <lukasz.luba@arm.com>

Thanks for the review

-- Daniel


--
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

\
 
 \ /
  Last update: 2020-11-10 13:56    [W:0.079 / U:42.648 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site