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Add a VM flag to prevent reclaim on a failed contig allocation

Description

Add a VM flag to prevent reclaim on a failed contig allocation

If a M_WAITOK contig alloc fails, the VM subsystem will try to
reclaim contiguous memory twice before actually failing the
request. On a system with 64GB of RAM I've observed this take
400-500ms before it finally gives up, and I believe that this
will only be worse on systems with even more memory.

In certain contexts this delay is extremely harmful, so add a flag
that will skip reclaim for allocation requests to allow those
paths to opt-out of doing an expensive reclaim.

Sponsored by: Dell Inc
Differential Revision: https://reviews.freebsd.org/D28422
Reviewed by: markj, kib

Details

Provenance
rstoneAuthored on Jan 29 2021, 9:13 PM
Reviewer
markj
Differential Revision
D28422: Add a VM flag to prevent reclaim on a failed contig allocation
Parents
R10:8727c174b0fe: dwmmc: Multiple busdma fixes.
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