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Make kern.cam.nda.num_trim tunable to limit the number of BIO_DELETE

Description

Make kern.cam.nda.num_trim tunable to limit the number of BIO_DELETE
requests that we'll collapse into one DSM_TRIM. By default it is a
256, which is the max that will fit into a 4k page.

Sponsored by: Netflix

Details

Provenance
impAuthored on
Parents
rS331237: Remove some redundant MPSAFE flags.
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