Zach Brown 4e8a088cc5 Don't use vmalloc in get/set xattr ...

Extended attribute values can be larger than a reasonable maximum size
for our btree items so we store xattrs in many items.  The first pass at
this code used vmalloc to make it relatively easy to work with a
contiguous buffer that was cut up into multiple items.

The problem, of course, is that vmalloc() is expensive.  Well, the
problem is that I always forget just how expensive it can be and use it
when I shouldn't.  We had loads on high cpu count machines that were
catastrophically cpu bound on all the contentious work that vmalloc does
to maintain a coherent global address space.

This removes the use of vmalloc and only allocates a small buffer for
the first compound item.  The later items directly reference regions of
value buffer rather than copying it to and from the large intermediate
vmalloced buffer.

Signed-off-by: Zach Brown <zab@versity.com>

2022-03-21 21:44:11 -07:00

..

src

Don't use vmalloc in get/set xattr

2022-03-21 21:44:11 -07:00

.gitignore

scoutfs: update rpm building infrastructure

2018-09-14 15:07:10 -07:00

Makefile

Filesystem version instead of format hash check

2021-01-15 10:53:00 -08:00

scoutfs-kmod.spec.in

scoutfs: update rpm building infrastructure

2018-09-14 15:07:10 -07:00