Re: [PATCH v6 17/22] drm/shmem-helper: Add generic memory shrinker

[Dmitry Osipenko]

20.06.2022 18:37, Rob Clark пишет:
>> +static unsigned long
>> +drm_gem_shmem_shrinker_scan_objects(struct shrinker *shrinker,
>> +                                   struct shrink_control *sc)
>> +{
>> +       unsigned long nr_to_scan = sc->nr_to_scan;
>> +       bool lock_contention = false;
>> +       unsigned long freed;
>> +
>> +       /* purge as many objects as we can */
>> +       freed = drm_gem_shmem_shrinker_run_objects_scan(shrinker, nr_to_scan,
>> +                                                       &lock_contention, false);
>> +
>> +       /* evict as many objects as we can */
>> +       if (freed < nr_to_scan)
> oh, one other small note, both in scan_objects() and count_objects(),
> you should check that get_nr_swap_pages()>0 before counting
> evictable/willneed objects.  (And you probably want to keep separate
> LRUs for dontneed vs willneed to accomplish that.)  At least for CrOS,
> inside the VM there is no swap enabled (but instead we rely on zram
> swap in the host.. plus vm-balloon to balance memory pressure between
> host and guest)

Noted, thank you!