2a4419b5b2
fs: fs_struct rwlock to spinlock struct fs_struct.lock is an rwlock with the read-side used to protect root and pwd members while taking references to them. Taking a reference to a path typically requires just 2 atomic ops, so the critical section is very small. Parallel read-side operations would have cacheline contention on the lock, the dentry, and the vfsmount cachelines, so the rwlock is unlikely to ever give a real parallelism increase. Replace it with a spinlock to avoid one or two atomic operations in typical path lookup fastpath. Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| config.c | ||
| crypto.c | ||
| dir.c | ||
| inode.c | ||
| lock.c | ||
| mcache.c | ||
| net.c | ||
| netfs.h | ||
| path_entry.c | ||
| trans.c | ||