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From: "dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug testsuite/13650] New: on rawhide, 'scan_unevictable_pages' warning
Date: Wed, 01 Feb 2012 21:47:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13650

             Bug #: 13650
           Summary: on rawhide, 'scan_unevictable_pages' warning
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
        AssignedTo: systemtap@sourceware.org
        ReportedBy: dsmith@redhat.com
    Classification: Unclassified


When running the systemtap.examples/check.exp testcase on
3.3.0-0.rc2.git0.2.fc17.x86_64, I see the following pop up in
/var/log/messages:

----
Feb  1 15:30:58 kvm-rawhide-64-2 kernel: [   <7>[  332.018775]
stap_551dc998a8f546ae21488b0870e1a28e_1012: systemtap: 1.7/0.152, base:
ffffffffa0209000, memory: 21data/20text/5ctx/2058net/9alloc kb, probes: 1
Feb  1 15:31:28 kvm-rawhide-64-2 kernel: cat: The scan_unevictable_pages
sysctl/node-interface has been disabled for lack of a legitimate use case.  If
you have one, please send an email to linux-mm@kvack.org.
----

This warning comes from the warn_scan_unevictable_pages() kernel function
(mm/vmscan.c).  I haven't narrowed down which specific example test causes this
to appear.

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