From 08d9e2162ca2825565e21422f95caa9f5f4b900b Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Wed, 15 Apr 2026 15:06:13 +0100 Subject: [PATCH] btrfs: reduce size of struct btrfs_free_space_ctl We have a 4 bytes hole in the structure, reorder some fields so that we eliminate the hole and reduce the structure size from 144 bytes down to 136 bytes. This way on a 4K page system, we can fit 30 structures per page instead of 28. Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/free-space-cache.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h index 2ee0b876723a..c5d0f3e056cc 100644 --- a/fs/btrfs/free-space-cache.h +++ b/fs/btrfs/free-space-cache.h @@ -74,13 +74,13 @@ enum { }; struct btrfs_free_space_ctl { - spinlock_t tree_lock; struct rb_root free_space_offset; struct rb_root_cached free_space_bytes; - u64 free_space; + spinlock_t tree_lock; int extents_thresh; int free_extents; int total_bitmaps; + u64 free_space; s32 discardable_extents[BTRFS_STAT_NR_ENTRIES]; s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES]; const struct btrfs_free_space_op *op;