MFC 278040:

Prevent inlining txg_quiesce

This allows dtrace to monitor the calls to txg_quiesce which can be
really helpful.

Also standardize __noinline order for arc_kmem_reap_now.

Sponsored by: Multiplay

Approved by: re

MFC r268859: MFV r268851:

When a sync task is waiting for a txg to complete, we should hurry it along
by increasing the number of outstanding async writes (i.e. make
vdev_queue_max_async_writes() return a larger number).

Illumos issue:
4753 increase number of outstanding async writes when sync task is waiting

MFC r258632,258704: MFV r255255: 4045 zfs write throttle & i/o scheduler
performance work

Sponsored by: HybridCluster [merge]

MFC 278040:

Prevent inlining txg_quiesce

This allows dtrace to monitor the calls to txg_quiesce which can be
really helpful.

Also standardize __noinline order for arc_kmem_reap_now.

Sponsored by: Multiplay

Approved by: re

MFC r268859: MFV r268851:

When a sync task is waiting for a txg to complete, we should hurry it along
by increasing the number of outstanding async writes (i.e. make
vdev_queue_max_async_writes() return a larger number).

Illumos issue:
4753 increase number of outstanding async writes when sync task is waiting

MFC r258632,258704: MFV r255255: 4045 zfs write throttle & i/o scheduler
performance work

Sponsored by: HybridCluster [merge]