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Deadlocks in the zvol were observed when one of the ZFS threads performing IO trys to allocate memory while the system is low on memory. The low memory condition causes dirty pages to be synced to the zvol but this can't progress because the original thread is blocked waiting on a memory allocation. Thus we end up deadlocking. A proper solution proposed by Wizeman is to change KM_SLEEP from GFP_KERNEL top GFP_NOFS. This will prevent the memory allocation which is trying to allocate memory from forcing a sync to the zvol in shrink_page_list()->pageout(). The down side to all of this is that we are using a pretty big hammer by changing KM_SLEEP. This change means ALL of the zfs memory allocations will be until to trigger dirty data to be synced. The caller still should be able to reclaim memory from the various slab caches. We will be totally dependent of other kernel processes which happen to be running and a small number of asynchronous reclaim threads to trigger the reclaim of dirty data pages. This should be OK but I think we may see some slightly longer allocation times when under memory pressure. We shall see. |
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| autogen.sh | ||
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| configure | ||
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| DISCLAIMER | ||
| INSTALL | ||
| Makefile.am | ||
| Makefile.in | ||
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| README.markdown | ||
| spl_config.h.in | ||
| spl-modules.spec.in | ||
| spl.spec.in | ||
The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
Documentation for building, configuring, and using the SPL can be found at: http://wiki.github.com/behlendorf/spl/