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authorAlexey Dobriyan <adobriyan@gmail.com>2018-04-10 16:31:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 10:28:34 -0700
commitb4884f23331ae31e9ecb617956986c3b76ab9a91 (patch)
tree2f25f7337f1aedbfed4fa18b1b26ffa208136544 /fs/proc/root.c
parentc4219edf1de2af44fd98903f72f6e1ceb7f3c701 (diff)
proc: move "struct proc_dir_entry" into kmem cache
"struct proc_dir_entry" is variable sized because of 0-length trailing array for name, however, because of SLAB padding allocations it is possible to make "struct proc_dir_entry" fixed sized and allocate same amount of memory. It buys fine-grained debugging with poisoning and usercopy protection which is not possible with kmalloc-* caches. Currently, on 32-bit 91+ byte allocations go into kmalloc-128 and on 64-bit 147+ byte allocations go to kmalloc-192 anyway. Additional memory is allocated only for 38/46+ byte long names which are rare or may not even exist in the wild. Link: http://lkml.kernel.org/r/20180223205504.GA17139@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> 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.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 98797b762a71..cd45abfbb6cc 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -208,7 +208,8 @@ struct proc_dir_entry proc_root = {
.proc_fops = &proc_root_operations,
.parent = &proc_root,
.subdir = RB_ROOT_CACHED,
- .name = "/proc",
+ .name = proc_root.inline_name,
+ .inline_name = "/proc",
};
int pid_ns_prepare_proc(struct pid_namespace *ns)