Differential D2096

Use a reader count instead of holding lock.
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Authored by sson on Mar 19 2015, 3:54 PM.

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Summary

This change uses a reader count instead of holding the mutex for the
interpreter list to avoid the problem of holding a non-sleep lock during
a page fault as reported by witness. In addition, it consistently uses
memset()/memcpy() instead of bzero()/bcopy().

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sson updated this revision to Diff 4287.Mar 19 2015, 3:54 PM

sson retitled this revision from to Use a reader count instead of holding lock..

sson updated this object.

sson edited the test plan for this revision. (Show Details)

sson added a reviewer: sbruno.

sson set the repository for this revision to rS FreeBSD src repository - subversion.

sson added a subscriber: sbruno.

Wasn't sure if this was ready or not, but I've updated tasty.ysv.freebsd.org and applied this patch to it. Doesn't look very happy as poudriere immediately fails as basic sysctl's are not working from withing the ARM jail I'm using:

root@tasty.ysv:/home/sbruno # poudriere testport -j 11armv6 -o www/webkit-qt5 -I
[00:00:00] ====>> Creating the reference jail... done
[00:00:01] ====>> Mounting system devices for 11armv6-default
[00:00:01] ====>> Mounting ports/packages/distfiles
[00:00:01] ====>> Using packages from previously failed build
[00:00:01] ====>> Mounting packages from: /usr/local/poudriere/data/packages/11armv6-default
[00:00:01] ====>> Mounting /var/db/ports from: /usr/local/etc/poudriere.d/options
/etc/resolv.conf -> /usr/local/poudriere/data/.m/11armv6-default/ref/etc/resolv.conf
[00:00:01] ====>> Starting jail 11armv6-default
sysctl: unknown oid 'kern.smp/sbin/sysctl': No such file or directory
make: "/usr/ports/Mk/bsd.port.mk" line 2053: warning: "/sbin/sysctl -n kern.smp.cpus" returned non-zero status
WARNING (www/webkit-qt5): sysctl: unknown oid 'kern.smp/sbin/sysctl': No such file or directory 
WARNING (www/webkit-qt5): make[1]: "/usr/ports/Mk/bsd.port.mk" line 2053: warning: "/sbin/sysctl -n kern.smp.cpus" returned non-zero status 
WARNING (www/webkit-qt5): sysctl: unknown oid 'kern.arg/sbin/sysctl': No such file or directory 
WARNING (www/webkit-qt5): make[1]: "/usr/ports/Mk/bsd.port.mk" line 2684: warning: "/sbin/sysctl -n kern.argmax" returned non-zero status 
WARNING (www/webkit-qt5): sysctl: unknown oid 'kern.smp/sbin/sysctl': No such file or directory 
WARNING (www/webkit-qt5): make: "/usr/ports/Mk/bsd.port.mk" line 2053: warning: "/sbin/sysctl -n kern.smp.cpus" returned non-zero status 
[00:00:04] ====>> Logs: /usr/local/poudriere/data/logs/bulk/11armv6-default/2015-03-24_02h07m40s

This revision now requires changes to proceed.Mar 24 2015, 2:10 AM

This has been replaced by https://reviews.freebsd.org/D2123