[Devel] [PATCH RHEL7 COMMIT] fuse: increase min/max_dirty_pages up to 256/512 MB

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-327.10.1.vz7.12.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-327.10.1.vz7.12.15
------>
commit 851b61670a39e50d87a6ee1120e0f7d4b7a45bc0
Author: Vladimir Davydov <vdavydov at virtuozzo.com>
Date:   Fri Apr 29 18:30:33 2016 +0400

    fuse: increase min/max_dirty_pages up to 256/512 MB
    
    According to Alexey, the pstorage chunk size was increased from 64 MB up
    to 256 MB, which made the default min/max fuse dirty pages limits (64
    and 256 MB) too low to yield maximal rate while doing sequential writes
    over pstorage. Let's increase the default limits up to 256 and 512 MB
    respectively to restore pstorage performance.
    
    Suggested-by: Alexey Kuznetsov <kuznet at virtuozzo.com>
    Signed-off-by: Vladimir Davydov <vdavydov at virtuozzo.com>
    
    Acked-by: Maxim Patlasov <mpatlasov at virtuozzo.com>
---
 fs/fuse/inode.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index bb010cb..3772b62 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1100,8 +1100,8 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
 	/*
 	 * These values have precedence over max_ratio
 	 */
-	bdi_set_max_dirty(&fc->bdi, (256 * 1024 * 1024) / PAGE_SIZE);
-	bdi_set_min_dirty(&fc->bdi, (64 * 1024 * 1024) / PAGE_SIZE);
+	bdi_set_max_dirty(&fc->bdi, (512 * 1024 * 1024) / PAGE_SIZE);
+	bdi_set_min_dirty(&fc->bdi, (256 * 1024 * 1024) / PAGE_SIZE);
 
 	return 0;
 }