Date: Tue, 15 Feb 2011 09:03:58 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/vm vm_kern.c Message-ID: <201102150904.p1F94BTI007150@repoman.freebsd.org>
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kib 2011-02-15 09:03:58 UTC
FreeBSD src repository
Modified files:
sys/vm vm_kern.c
Log:
SVN rev 218701 on 2011-02-15 09:03:58Z by kib
Since r218070 reenabled the call to vm_map_simplify_entry() from
vm_map_insert(), the kmem_back() assumption about newly inserted
entry might be broken due to interference of two factors. In the low
memory condition, when vm_page_alloc() returns NULL, supplied map is
unlocked. If another thread performs kmem_malloc() meantime, and its
map entry is placed right next to our thread map entry in the map,
both entries wire count is still 0 and entries are coalesced due to
vm_map_simplify_entry().
Mark new entry with MAP_ENTRY_IN_TRANSITION to prevent coalesce.
Fix some style issues, tighten the assertions to account for
MAP_ENTRY_IN_TRANSITION state.
Reported and tested by: pho
Reviewed by: alc
Revision Changes Path
1.147 +23 -9 src/sys/vm/vm_kern.c
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