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29 July 2024, 15:18:00 UTC
Revision 3272c544da48f8915a0e34189182aed029bd0f2b authored by Linus Torvalds on 12 September 2013, 19:40:15 UTC, committed by Linus Torvalds on 12 September 2013, 19:40:15 UTC 
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>
1 parent ff812d7
History
Tip revision: 3272c544da48f8915a0e34189182aed029bd0f2b authored by Linus Torvalds on 12 September 2013, 19:40:15 UTC
vfs: use __getname/__putname for getcwd() system call
Tip revision: 3272c54
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.gitignore -rw-r--r-- 1.1 KB
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