Florian Westphal f330a7fdbe netfilter: conntrack: get rid of conntrack timer ... With stats enabled this eats 80 bytes on x86_64 per nf_conn entry, as Eric Dumazet pointed out during netfilter workshop 2016. Eric also says: "Another reason was the fact that Thomas was about to change max timer range [..]" (500462a9de, 'timers: Switch to a non-cascading wheel'). Remove the timer and use a 32bit jiffies value containing timestamp until entry is valid. During conntrack lookup, even before doing tuple comparision, check the timeout value and evict the entry in case it is too old. The dying bit is used as a synchronization point to avoid races where multiple cpus try to evict the same entry. Because lookup is always lockless, we need to bump the refcnt once when we evict, else we could try to evict already-dead entry that is being recycled. This is the standard/expected way when conntrack entries are destroyed. Followup patches will introduce garbage colliction via work queue and further places where we can reap obsoleted entries (e.g. during netlink dumps), this is needed to avoid expired conntracks from hanging around for too long when lookup rate is low after a busy period. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>		2016-08-30 11:43:09 +02:00
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acpi	treewide: replace obsolete _refok by __ref	2016-08-02 17:31:41 -04:00
asm-generic	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2016-08-02 16:37:12 -04:00
clocksource	…
crypto	A number of improvements for the /dev/random driver; the most	2016-07-27 15:11:55 -07:00
drm	drm/dp: Add drm_dp_psr_setup_time()	2016-08-03 07:06:28 +10:00
dt-bindings	ARM: DT updates for v4.8	2016-08-01 18:37:45 -04:00
keys	…
kvm	- ARM: GICv3 ITS emulation and various fixes. Removal of the old	2016-08-02 16:11:27 -04:00
linux	rhashtable: add rhashtable_lookup_get_insert_key()	2016-08-26 17:29:41 +02:00
math-emu	…
media	…
memory	…
misc	…
net	netfilter: conntrack: get rid of conntrack timer	2016-08-30 11:43:09 +02:00
pcmcia	…
ras	…
rdma	…
rxrpc	…
scsi	…
soc	ARM: SoC driver updates for v4.8	2016-08-01 18:36:01 -04:00
sound	Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux	2016-08-01 21:44:08 -04:00
target	…
trace	- ARM: GICv3 ITS emulation and various fixes. Removal of the old	2016-08-02 16:11:27 -04:00
uapi	netfilter: nf_tables: typo in trace attribute definition	2016-08-23 16:05:02 +02:00
video	…
xen	…
Kbuild	…