| commit | 0f1a394ba68c4bbdedb1dbfdf6784ba54c07bbe4 | [log] [tgz] |
|---|---|---|
| author | Paul Mundt <lethal@linux-sh.org> | Mon Nov 19 13:05:18 2007 +0900 |
| committer | Paul Mundt <lethal@linux-sh.org> | Mon Nov 19 13:05:18 2007 +0900 |
| tree | ef68075d7d43e8f458bf653f072ae2f8cc0bcbd1 | |
| parent | 1c6b2ca5e0939bf8b5d1a11f1646f25189ecd447 [diff] |
sh: lockless UTLB miss fast-path. With the refactored update_mmu_cache() introduced in older kernels, there's no longer any need to take the page_table_lock in this path, so simply drop it completely. Without this, performance degradation is seen on SMP on heavily threaded workloads that don't use the split ptlock, and ultimately we have no reason to contend for the lock in the first place. Signed-off-by: Paul Mundt <lethal@linux-sh.org>