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27 March 2024, 02:37:15 UTC
Revision d2a97a4e99ff0ffdccd1fc46f22fb34270ef1e56 authored by Steven Whitehouse on 28 July 2010, 16:56:23 UTC, committed by Linus Torvalds on 28 July 2010, 18:10:03 UTC 
GFS2: Use kmalloc when possible for ->readdir()
 
If we don't need a huge amount of memory in ->readdir() then
we can use kmalloc rather than vmalloc to allocate it. This
should cut down on the greater overheads associated with
vmalloc for smaller directories.

We may be able to eliminate vmalloc entirely at some stage,
but this is easy to do right away.

Also using GFP_NOFS to avoid any issues wrt to deleting inodes
while under a glock, and suggestion from Linus to factor out
the alloc/dealloc.

I've given this a test with a variety of different sized
directories and it seems to work ok.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent fc0f5ac
History
Tip revision: d2a97a4e99ff0ffdccd1fc46f22fb34270ef1e56 authored by Steven Whitehouse on 28 July 2010, 16:56:23 UTC
GFS2: Use kmalloc when possible for ->readdir()
Tip revision: d2a97a4
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