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Dipankar Sarma 529bf6be5c [PATCH] fix file counting ... I have benchmarked this on an x86_64 NUMA system and see no significant performance difference on kernbench. Tested on both x86_64 and powerpc. The way we do file struct accounting is not very suitable for batched freeing. For scalability reasons, file accounting was constructor/destructor based. This meant that nr_files was decremented only when the object was removed from the slab cache. This is susceptible to slab fragmentation. With RCU based file structure, consequent batched freeing and a test program like Serge's, we just speed this up and end up with a very fragmented slab - llm22:~ # cat /proc/sys/fs/file-nr 587730 0 758844 At the same time, I see only a 2000+ objects in filp cache. The following patch I fixes this problem. This patch changes the file counting by removing the filp_count_lock. Instead we use a separate percpu counter, nr_files, for now and all accesses to it are through get_nr_files() api. In the sysctl handler for nr_files, we populate files_stat.nr_files before returning to user. Counting files as an when they are created and destroyed (as opposed to inside slab) allows us to correctly count open files with RCU. Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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802	…
8021q	…
appletalk	…
atm	[ATM]: keep atmsvc failure messages quiet	19 years ago
ax25	…
bluetooth	…
bridge	[BRIDGE]: generate kobject remove event	19 years ago
core	[REQSK]: Don't reset rskq_defer_accept in reqsk_queue_alloc	19 years ago
dccp	[DCCP] ccid3: Divide by zero fix	19 years ago
decnet	…
econet	…
ethernet	…
ieee80211	[PATCH] ieee80211_rx.c: is_beacon	19 years ago
ipv4	[NETFILTER] ip_queue: Fix wrong skb->len == nlmsg_len assumption	19 years ago
ipv6	[NETFILTER] ip_queue: Fix wrong skb->len == nlmsg_len assumption	19 years ago
ipx	…
irda	…
key	…
lapb	…
llc	…
netfilter	[NETFILTER]: nf_queue: fix end-of-list check	19 years ago
netlink	…
netrom	…
packet	…
rose	…
rxrpc	…
sched	…
sctp	…
sunrpc	…
tipc	…
unix	[PATCH] fix file counting	19 years ago
wanrouter	…
x25	…
xfrm	[IPSEC]: Kill post_input hook and do NAT-T in esp_input directly	19 years ago
Kconfig	…
Makefile	…
TUNABLE	…
compat.c	…
nonet.c	…
socket.c	…
sysctl_net.c	…