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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-12 15:40:15 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-12 15:40:15 -0400 |
commit | 3272c544da48f8915a0e34189182aed029bd0f2b (patch) | |
tree | e2d6aacc2de8f26c14e844af6ed245b8a43d7978 /fs/nfs | |
parent | ff812d724254b95df76b7775d1359d856927a840 (diff) |
vfs: use __getname/__putname for getcwd() system call
It's a pathname. It should use the pathname allocators and
deallocators, and PATH_MAX instead of PAGE_SIZE. Never mind that the
two are commonly the same.
With this, the allocations scale up nicely too, and I can do getcwd()
system calls at a rate of about 300M/s, with no lock contention
anywhere.
Of course, nobody sane does that, especially since getcwd() is
traditionally a very slow operation in Unix. But this was also the
simplest way to benchmark the prepend_path() improvements by Waiman, and
once I saw the profiles I couldn't leave it well enough alone.
But apart from being an performance improvement (from using per-cpu slab
allocators instead of the raw page allocator), it's actually a valid and
real cleanup.
Signed-off-by: Linus "OCD" Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nfs')
0 files changed, 0 insertions, 0 deletions