From: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
David Miller <davem@davemloft.net>
Cc: Scot Doyle <lkml@scotdoyle.com>,
Stephen Hemminger <shemminger@vyatta.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH] inetpeer: reduce stack usage
Date: Tue, 12 Apr 2011 23:51:26 +0900 [thread overview]
Message-ID: <20110412235126.63841dfe.shimoda.hiroaki@gmail.com> (raw)
In-Reply-To: <1302597580.3233.14.camel@edumazet-laptop>
On Tue, 12 Apr 2011 10:39:40 +0200
Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On 64bit arches, we use 752 bytes of stack when cleanup_once() is called
> from inet_getpeer().
>
> Lets share the avl stack to save ~376 bytes.
>
> Before patch :
>
> # objdump -d net/ipv4/inetpeer.o | scripts/checkstack.pl
>
> 0x000006c3 unlink_from_pool [inetpeer.o]: 376
> 0x00000721 unlink_from_pool [inetpeer.o]: 376
> 0x00000cb1 inet_getpeer [inetpeer.o]: 376
> 0x00000e6d inet_getpeer [inetpeer.o]: 376
> 0x0004 inet_initpeers [inetpeer.o]: 112
> # size net/ipv4/inetpeer.o
> text data bss dec hex filename
> 5320 432 21 5773 168d net/ipv4/inetpeer.o
>
> After patch :
>
> objdump -d net/ipv4/inetpeer.o | scripts/checkstack.pl
> 0x00000c11 inet_getpeer [inetpeer.o]: 376
> 0x00000dcd inet_getpeer [inetpeer.o]: 376
> 0x00000ab9 peer_check_expire [inetpeer.o]: 328
> 0x00000b7f peer_check_expire [inetpeer.o]: 328
> 0x0004 inet_initpeers [inetpeer.o]: 112
> # size net/ipv4/inetpeer.o
> text data bss dec hex filename
> 5163 432 21 5616 15f0 net/ipv4/inetpeer.o
>
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
> Cc: Scot Doyle <lkml@scotdoyle.com>
> Cc: Stephen Hemminger <shemminger@vyatta.com>
> Cc: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
I couldn't understand that actually cleanup_once() was called
from inet_getpeer() and then the stack overflow was hit,
but this patch surely reduces stack usage.
Reviewed-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
Thanks.
next prev parent reply other threads:[~2011-04-12 14:51 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-08 1:20 Kernel panic when using bridge Scot Doyle
2011-04-08 13:49 ` Sebastian Nickel
2011-04-08 14:57 ` Scot Doyle
2011-04-08 19:12 ` Pallai Roland
2011-04-08 19:17 ` Stephen Hemminger
2011-04-09 4:51 ` Scot Doyle
2011-04-09 7:19 ` Hiroaki SHIMODA
2011-04-11 23:48 ` Scot Doyle
2011-04-12 1:31 ` Stephen Hemminger
2011-04-12 3:47 ` Scot Doyle
2011-04-12 4:09 ` Eric Dumazet
2011-04-12 4:22 ` Eric Dumazet
2011-04-12 5:17 ` Scot Doyle
2011-04-12 5:51 ` Eric Dumazet
2011-04-12 7:02 ` Scot Doyle
2011-04-12 7:31 ` Eric Dumazet
2011-04-12 8:39 ` [PATCH] inetpeer: reduce stack usage Eric Dumazet
2011-04-12 14:51 ` Hiroaki SHIMODA [this message]
2011-04-12 14:55 ` Eric Dumazet
2011-04-12 20:58 ` David Miller
2011-04-12 11:49 ` Kernel panic when using bridge Eric Dumazet
2011-04-12 13:02 ` Jan Lübbe
2011-04-12 13:15 ` Eric Dumazet
2011-04-12 14:19 ` Jan Lübbe
2011-04-12 14:49 ` Eric Dumazet
2011-04-12 15:13 ` Jan Lübbe
2011-04-12 16:14 ` Eric Dumazet
2011-04-12 16:20 ` Stephen Hemminger
2011-04-12 16:35 ` Eric Dumazet
2011-04-12 16:45 ` Bandan Das
2011-04-12 16:54 ` Eric Dumazet
2011-04-12 17:18 ` [PATCH] bridge: reset IPCB in br_parse_ip_options Eric Dumazet
2011-04-12 20:39 ` David Miller
2011-04-12 23:55 ` Scot Doyle
2011-04-13 4:12 ` Scot Doyle
2011-04-13 15:10 ` Scot Doyle
2011-04-13 15:24 ` Stephen Hemminger
2011-04-13 15:54 ` Scot Doyle
2011-04-13 15:28 ` Eric Dumazet
2011-04-13 21:48 ` David Miller
2011-04-14 0:03 ` Stephen Hemminger
2011-04-14 0:05 ` David Miller
2011-04-14 0:08 ` Stephen Hemminger
2011-04-14 2:31 ` Eric Dumazet
2011-04-14 2:54 ` Stephen Hemminger
2011-04-14 3:03 ` [PATCH] ip: ip_options_compile() resilient to NULL skb route Eric Dumazet
2011-04-14 3:30 ` Hiroaki SHIMODA
2011-04-14 3:37 ` Eric Dumazet
2011-04-14 4:15 ` Hiroaki SHIMODA
2011-04-14 13:34 ` Scot Doyle
2011-04-14 15:55 ` [PATCH v2] " Eric Dumazet
2011-04-14 22:02 ` Scot Doyle
2011-04-14 22:04 ` David Miller
2011-04-14 23:20 ` Hiroaki SHIMODA
2011-04-15 6:26 ` David Miller
2011-04-12 16:32 ` Kernel panic when using bridge Bandan Das
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