Subject: Re: [PATCH 2/2] ss: implement -M option to get all memory information

From: Shan Wei <[email-masked]>
Date: Thu, 03 May 2012 16:39:52 +0800

Stephen Hemminger said, at 2012/5/3 3:00:

> 
> This looks good, is the skmeminfo a superset of the old meminfo?

Yes, skmeminfo is a superset of old meminfo.
Using this can get more socket memory information. 

> But your code is broken on 64 bit. skmeminfo in kernel is an array of __u32!

OK. here is a new version.

----
[PATCH] ss: use new INET_DIAG_SKMEMINFO option to get more memory information for tcp socket

Signed-off-by: Shan Wei <[email-masked]>
---
 misc/ss.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index 5f70a26..bd60548 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -1336,7 +1336,17 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r)
 	parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr*)(r+1),
 		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
 
-	if (tb[INET_DIAG_MEMINFO]) {
+	if (tb[INET_DIAG_SKMEMINFO]) {
+		const __u32 *skmeminfo =  RTA_DATA(tb[INET_DIAG_SKMEMINFO]);
+		printf(" skmem:(r%u,rb%u,t%u,tb%u,f%u,w%u,o%u)",
+			skmeminfo[SK_MEMINFO_RMEM_ALLOC],
+			skmeminfo[SK_MEMINFO_RCVBUF],
+			skmeminfo[SK_MEMINFO_WMEM_ALLOC],
+			skmeminfo[SK_MEMINFO_SNDBUF],
+			skmeminfo[SK_MEMINFO_FWD_ALLOC],
+			skmeminfo[SK_MEMINFO_WMEM_QUEUED],
+			skmeminfo[SK_MEMINFO_OPTMEM]);
+	}else if (tb[INET_DIAG_MEMINFO]) {
 		const struct inet_diag_meminfo *minfo
 			= RTA_DATA(tb[INET_DIAG_MEMINFO]);
 		printf(" mem:(r%u,w%u,f%u,t%u)",
@@ -1505,8 +1515,10 @@ static int tcp_show_netlink(struct filter *f, FILE *dump_fp, int socktype)
 	memset(&req.r, 0, sizeof(req.r));
 	req.r.idiag_family = AF_INET;
 	req.r.idiag_states = f->states;
-	if (show_mem)
+	if (show_mem) {
 		req.r.idiag_ext |= (1<<(INET_DIAG_MEMINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_SKMEMINFO-1));
+	}
 
 	if (show_tcpinfo) {
 		req.r.idiag_ext |= (1<<(INET_DIAG_INFO-1));
-- 
1.7.1