LinuxKPI: allocate current before taking shrinkers lock

This fixes following warnings when shrinkers are invoked first time:

uma_zalloc_debug: zone "lkpicurr" with the following non-sleepable
locks

LinuxKPI: allocate current before taking shrinkers lock

This fixes following warnings when shrinkers are invoked first time:

uma_zalloc_debug: zone "lkpicurr" with the following non-sleepable
locks held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker)

uma_zalloc_debug: zone "lkpimm" with the following non-sleepable locks
held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker)

Reviewed by: hselasky, manu
Differential revision: https://reviews.freebsd.org/D32066

(cherry picked from commit 2fe9ea5d3ad69d880138d98b2ae8d2c4309eeafa)

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linuxkpi: Fix the shrinker scan target

Use the number of items scanned to control the duration of the shrink
loop. Otherwise, if a consumer like TTM is not able to free the number
of items requeste

linuxkpi: Fix the shrinker scan target

Use the number of items scanned to control the duration of the shrink
loop. Otherwise, if a consumer like TTM is not able to free the number
of items requested for some reason, the shrinker keeps looping forever.

Reviewed by: manu
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28224

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linuxkpi: Add shrinker support

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

linuxkpi: Add shrinker support

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.

Reviewed by: bz
Differential Revision: https://reviews.freebsd.org/D27728

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