[Bug 223831] [patch] swap_pager.c to release multiple swap blocks at a time

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223831

            Bug ID: 223831
           Summary: [patch] swap_pager.c to release multiple swap blocks
                    at a time
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ota at j.email.ne.jp
          Keywords: patch

Created attachment 188225
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=188225&action=edit
release multiple blocks at a time

This allows to release multiple swap blocks via swp_pager_freeswapspace().

For each call, swp_pager_freeswapspace() locks.  Releasing multiple
blocks helps to reduce number of locks.  If a swblk contains
continuous blocks, it reduces up to SWAP_META_PAGES-1 locks.

This patch covers 2 case: 1. when a process exits and all of its
swap blocks are released and 2. when a process is paged in from
swap space.

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