Date: Tue, 10 Jun 2008 12:51:43 +0200 (CEST) From: "Walter C. Pelissero" <walter.pelissero@iesy.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: ports/124441: wmmemfree doesn't report swap changes Message-ID: <200806101051.m5AAphJu018480@zaphod.home.loc> Resent-Message-ID: <200806101100.m5AB05As038196@freefall.freebsd.org>
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>Number: 124441
>Category: ports
>Synopsis: wmmemfree doesn't report swap changes
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jun 10 11:00:04 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: Walter C. Pelissero
>Release: FreeBSD 7.0-STABLE i386
>Organization:
>Environment:
System: FreeBSD zaphod.home.loc 7.0-STABLE FreeBSD 7.0-STABLE #1: Sat May 31 19:48:11 CEST 2008 root@zaphod.home.loc:/usr/src/sys/i386/compile/TYAN-TIGER-MP i386
>Description:
At least on FreeBSD 7.0 wmmemfree doesn't report the swap
usage changes. Only the first figure is actually correct, but
thereafter never again.
>How-To-Repeat:
Run wmmemfree. Run anything large that would require paging.
Observe that the reported swap usage doesn't change. Ever.
>Fix:
As a workaround, the following patch gets rid of a test that
is never true in mem_freebsd.c (included with the port) and
gives more time between the updates due to the comment just
above that test.
--- /usr/ports/sysutils/wmmemfree/files/mem_freebsd.c 2005-03-14 17:59:06.000000000 +0100
+++ mem_freebsd.c 2008-06-10 12:34:17.000000000 +0200
@@ -105,10 +105,7 @@
curtime = time(NULL);
- if (firsttime ||
- (((vm.v_swappgsin > pagesin) ||
- (vm.v_swappgsout > pagesout))
- && curtime > lasttime + 1))
+ if (firsttime || (curtime > lasttime + 5))
{
if (kvm_getswapinfo(kd, &sw, 1, 0) >= 0 &&
sw.ksw_total)
I dont' believe this is the final solution to this problem.
There is obviously something wrong about the test on
v_swappgsin and v_swappgsout that I couldn't figure out in the
ten minutes it took me to write this workaround.
>Release-Note:
>Audit-Trail:
>Unformatted:
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