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authorEric Dumazet <dada1@cosmosbay.com>2007-04-19 16:16:32 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:23:34 -0700
commitb7aa0bf70c4afb9e38be25f5c0922498d0f8684c (patch)
tree4bc9d61031f4eb40d73887d6bde09e7d6bf2b259 /kernel
parent3927f2e8f9afa3424bb51ca81f7abac01ffd0005 (diff)
downloadlinux-linaro-stable-b7aa0bf70c4afb9e38be25f5c0922498d0f8684c.tar.gz
[NET]: convert network timestamps to ktime_t
We currently use a special structure (struct skb_timeval) and plain 'struct timeval' to store packet timestamps in sk_buffs and struct sock. This has some drawbacks : - Fixed resolution of micro second. - Waste of space on 64bit platforms where sizeof(struct timeval)=16 I suggest using ktime_t that is a nice abstraction of high resolution time services, currently capable of nanosecond resolution. As sizeof(ktime_t) is 8 bytes, using ktime_t in 'struct sock' permits a 8 byte shrink of this structure on 64bit architectures. Some other structures also benefit from this size reduction (struct ipq in ipv4/ip_fragment.c, struct frag_queue in ipv6/reassembly.c, ...) Once this ktime infrastructure adopted, we can more easily provide nanosecond resolution on top of it. (ioctl SIOCGSTAMPNS and/or SO_TIMESTAMPNS/SCM_TIMESTAMPNS) Note : this patch includes a bug correction in compat_sock_get_timestamp() where a "err = 0;" was missing (so this syscall returned -ENOENT instead of 0) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> CC: Stephen Hemminger <shemminger@linux-foundation.org> CC: John find <linux.kernel@free.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time.c b/kernel/time.c
index 2f47888e46c9..a1439f421d0b 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -469,6 +469,7 @@ struct timeval ns_to_timeval(const s64 nsec)
return tv;
}
+EXPORT_SYMBOL(ns_to_timeval);
/*
* Convert jiffies to milliseconds and back.