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sctp: move sent_count to the memory hole in sctp_chunk

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Now pahole sctp_chunk, it has 2 memory holes:
   struct sctp_chunk {
	struct list_head           list;
	atomic_t                   refcnt;
	/* XXX 4 bytes hole, try to pack */
	...
	long unsigned int          prsctp_param;
	int                        sent_count;
	/* XXX 4 bytes hole, try to pack */

This patch is to move up sent_count to fill the 1st one and eliminate
the 2nd one.

It's not just another struct compaction, it also fixes the "netperf-
Throughput_Mbps -37.2% regression" issue when overloading the CPU.

Fixes: a6c2f79287 ("sctp: implement prsctp TTL policy")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2016-09-29 02:37:26 +08:00 committed by David S. Miller
parent 1b0ff89852
commit 73dca124cd
1 changed files with 3 additions and 3 deletions
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6
include/net/sctp/structs.h
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@ -554,6 +554,9 @@ struct sctp_chunk {
atomic_t refcnt;
/* How many times this chunk have been sent, for prsctp RTX policy */
int sent_count;
/* This is our link to the per-transport transmitted list. */
struct list_head transmitted_list;
@ -610,9 +613,6 @@ struct sctp_chunk {
*/
unsigned long prsctp_param;
/* How many times this chunk have been sent, for prsctp RTX policy */
int sent_count;
/* Which association does this belong to? */
struct sctp_association *asoc;