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authorAlexey Dobriyan <adobriyan@gmail.com>2018-04-11 02:32:20 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 20:28:34 +0300
commit4f1134370a29a5f2d0f4b4be4c5e2fddd38f0f9d (patch)
tree0fcae1f568cf1c2870f615e214f3e92a77afcd30 /fs/proc/root.c
parent05c3f29283af9e3da0ab7414f666cb37f530950a (diff)
downloadlinux-4f1134370a29a5f2d0f4b4be4c5e2fddd38f0f9d.tar.xz
proc: use slower rb_first()
In a typical for /proc "open+read+close" usecase, dentry is looked up successfully on open only to be killed in dput() on close. In fact dentries which aren't /proc/*/... and /proc/sys/* were almost NEVER CACHED. Simple printk in proc_lookup_de() shows that. Now that ->delete hook intelligently picks which dentries should live in dcache and which should not, rbtree caching is not necessary as dcache does it job, at last! As a side effect, struct proc_dir_entry shrinks by one pointer which can go into inline name. Link: http://lkml.kernel.org/r/20180314231032.GA15854@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/root.c')
-rw-r--r--fs/proc/root.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 76c996457ff9..61b7340b357a 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -203,7 +203,7 @@ struct proc_dir_entry proc_root = {
.proc_iops = &proc_root_inode_operations,
.proc_fops = &proc_root_operations,
.parent = &proc_root,
- .subdir = RB_ROOT_CACHED,
+ .subdir = RB_ROOT,
.name = proc_root.inline_name,
.inline_name = "/proc",
};