Differential D27728

linuxkpi: Add shrinker support
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Authored by manu on Dec 22 2020, 6:19 PM.

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linuxkpi

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rG2c95fb753fb2: linuxkpi: Add shrinker support

Summary

A driver can register a shrinker that will be called when the kernel
wants to free some memory.
Add support for that in linuxkpi and call the registered shrinkers
when the lowmem event is triggered.

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rG FreeBSD src repository

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Event Timeline

manu created this revision.Dec 22 2020, 6:19 PM

Herald added a subscriber: emaste. · View Herald TranscriptDec 22 2020, 6:19 PM

manu requested review of this revision.Dec 22 2020, 6:19 PM

bz added a subscriber: bz.Dec 22 2020, 7:12 PM

bz added inline comments.

sys/compat/linuxkpi/common/src/linux_shrinker.c
48	I always wonder if we should document that fields are initialised by at least adding KASSERT()s? I guess I've been calling too many NULL function pointers lately elsewhere which were never initialised or checked on registration.
71	batch is not needed until line 79; can it be initialised after the initial return?
78	No { } needed.
108	Long line.

manu added inline comments.Dec 23 2020, 9:51 AM

sys/compat/linuxkpi/common/src/linux_shrinker.c
48	you mean adding something like KASSERT(s->count_objects == NULL, ...) ? Anyway yeah I think that I should check that both function pointer are not NULL here.
71	Will change.
78	printf debugging leftover :) I'll change that.
108	Will change.