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sock: ulimit on MSG_ZEROCOPY pages

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Bound the number of pages that a user may pin.

Follow the lead of perf tools to maintain a per-user bound on memory
locked pages commit 789f90fcf6 ("perf_counter: per user mlock gift")

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2017-08-03 16:29:43 -04:00 • committed by David S. Miller
parent 4ab6c99d99
commit a91dbff551
3 changed files with 55 additions and 1 deletions
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5
include/linux/skbuff.h
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@ -457,6 +457,11 @@ struct ubuf_info {
};
};
atomic_t refcnt;
struct mmpin {
struct user_struct *user;
unsigned int num_pg;
} mmp;
};
#define skb_uarg(SKB) ((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))