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tcp: define macros for a couple reclaim thresholds

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A following patch is going to implement a similar reclaim schema
for the MPTCP protocol, with different locking.

Let's define a couple of macros for the used thresholds, so
that the latter code will be more easily maintainable.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2021-10-26 16:29:13 -07:00 committed by Jakub Kicinski
parent 9dfc685e02
commit 5823fc96d7
1 changed files with 7 additions and 2 deletions
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9
include/net/sock.h
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@ -1573,6 +1573,11 @@ static inline void sk_mem_charge(struct sock *sk, int size)
sk->sk_forward_alloc -= size;
}
/* the following macros control memory reclaiming in sk_mem_uncharge()
*/
#define SK_RECLAIM_THRESHOLD (1 << 21)
#define SK_RECLAIM_CHUNK (1 << 20)
static inline void sk_mem_uncharge(struct sock *sk, int size)
{
int reclaimable;
@ -1589,8 +1594,8 @@ static inline void sk_mem_uncharge(struct sock *sk, int size)
* If we reach 2 MBytes, reclaim 1 MBytes right now, there is
* no need to hold that much forward allocation anyway.
*/
if (unlikely(reclaimable >= 1 << 21))
__sk_mem_reclaim(sk, 1 << 20);
if (unlikely(reclaimable >= SK_RECLAIM_THRESHOLD))
__sk_mem_reclaim(sk, SK_RECLAIM_CHUNK);
}
static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb)