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

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Message-ID: <20120502120042.5420644a@s6510.linuxnetplumber.net>
Date:	Wed, 2 May 2012 12:00:42 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Shan Wei <shanwei88@...il.com>
Cc:	xemul@...allels.com, NetDev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] ss: implement -M option to get all memory
 information

On Wed, 02 May 2012 17:45:02 +0800
Shan Wei <shanwei88@...il.com> wrote:

> Hi stephen:
> 
> Stephen Hemminger said, at 2012/4/28 1:21:
> 
> > Lots of options return more or different information based on kernel
> > version, probably the biggest example is how stats are processed.
> 
> 
> how about the following patch?
> 
> ----
> [PATCH] ss: use new INET_DIAG_SKMEMINFO option to get memory information for tcp socket
> 
> 
> Signed-off-by: Shan Wei <davidshan@...cent.com>
> ---
>  misc/ss.c |   16 ++++++++++++++--
>  1 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/misc/ss.c b/misc/ss.c
> index 5f70a26..3cfc9e8 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 unsigned int *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));

This looks good, is the skmeminfo a superset of the old meminfo?
But your code is broken on 64 bit. skmeminfo in kernel is an array of __u32!
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