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To minimize the size of a kmutex_t a MUTEX_OWNER check was added. It allowed the kmutex_t wrapper to leverage the mutex owner which was already stored in the mutex for certain kernel configurations. The upside to this was that it reduced the size of the kmutex_t wrapper structure by the size of a task_struct pointer (4/8 bytes). The downside was that two mutex implementations needed to be maintained. Depending on your exact kernel configuration the correct one would be selected. Over the years this solution worked but it could be fragile since it depending heavily on assumed kernel mutex implementation details. For example the SPL_AC_MUTEX_OWNER_TASK_STRUCT configure check needed to be added when the kernel changed how the owner was stored. It also made the code more complicated than it needed to be. Therefore, in the name of simplicity and portability this optimization is being retired. It will slightly increase the memory requirements for a kmutex_t but only very slightly. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Issue #435 |
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