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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 23 Apr 2009 21:09:47 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/vm vm_object.c
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kib         2009-04-23 21:09:47 UTC

  FreeBSD src repository

  Modified files:
    sys/vm               vm_object.c 
  Log:
  SVN rev 191439 on 2009-04-23 21:09:47Z by kib
  
  Do not call vm_page_lookup() from the ddb routine, namely from "show
  vmopag" implementation. The vm_page_lookup() code modifies splay tree
  of the object pages, and asserts that object lock is taken. First issue
  could cause kernel data corruption, and second one instantly panics the
  INVARIANTS-enabled kernel.
  
  Take the advantage of the fact that object->memq is ordered by page index,
  and iterate over memq to calculate the runs.
  
  While there, make the code slightly more style-compliant by moving
  variables declarations to the right place.
  
  Discussed with: jhb, alc
  Reviewed by:    alc
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.402     +13 -19    src/sys/vm/vm_object.c