Commit 57fc05e8 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: mm_account_pinned_pages() optimization 



Adopt atomic_long_try_cmpxchg() in mm_account_pinned_pages()
as it is slightly more efficient.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8c55face

net/core/skbuff.c

+2 −3
Original line number Diff line number Diff line
@@ -1267,13 +1267,12 @@ int mm_account_pinned_pages(struct mmpin *mmp, size_t size) 
	max_pg = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;

	user = mmp->user ? : current_user();



	do {

	old_pg = atomic_long_read(&user->locked_vm);

	do {

		new_pg = old_pg + num_pg;

		if (new_pg > max_pg)

			return -ENOBUFS;

	} while (atomic_long_cmpxchg(&user->locked_vm, old_pg, new_pg) !=

		 old_pg);

	} while (!atomic_long_try_cmpxchg(&user->locked_vm, &old_pg, new_pg));



	if (!mmp->user) {

		mmp->user = get_uid(user);