2014-08-18 오후 12:24, Theodore Ts'o 쓴 글:
On Mon, Aug 18, 2014 at 10:15:32AM +0900, Gioh Kim wrote:
My test platform has totally 1GB memory, 256MB for CMA and 768MB for normal.
I applied Joonsoo's patch: https://lkml.org/lkml/2014/5/28/64, so that
3/4 of allocation take place in normal area and 1/4 allocation take place in
CMA area.
And my platform has 4 ext4 partitions. Each ext4 partition has 2 page caches
for superblock that
are what this patch tries to move to out of CMA area.
Therefore there are 8 page caches (8 pages size) that can prevent page
migration.
Yes, but are you actually *using* the ext4 partitions for anything?
If this is a realistic real world use case, file systems are used to
store, well, files, and that means there will be inodes and dentry
cache entries that will also be allocated. Does your test scenario
reflect real world usage?
Yes. I'm working for LG Electronics.
My test platform is currently selling item in the market.
And also I test my patch when my platform is working as if real user uses it.
I think the page caches of the inodes and dentry are held for short time.
I can see pairs of get_bh and put_bh in inodes/dentry handling.
I think inodes is allocated by kmem_cache_alloc in ext4_alloc_inode().
It is non-movable area allocation.
Cheers,
- Ted
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