On Wed, Apr 14, 2010 at 2:54 PM, KOSAKI Motohiro
<kosaki.motohiro@xxxxxxxxxxxxxx> wrote:
>> On Wed, Apr 14, 2010 at 01:59:45PM +0900, KAMEZAWA Hiroyuki wrote:
>> > On Wed, 14 Apr 2010 11:40:41 +1000
>> > Dave Chinner <david@xxxxxxxxxxxxx> wrote:
>> >
>> > > 50) 3168 64 xfs_vm_writepage+0xab/0x160 [xfs]
>> > > 51) 3104 384 shrink_page_list+0x65e/0x840
>> > > 52) 2720 528 shrink_zone+0x63f/0xe10
>> >
>> > A bit OFF TOPIC.
>> >
>> > Could you share disassemble of shrink_zone() ?
>> >
>> > In my environ.
>> > 00000000000115a0 <shrink_zone>:
>> > 115a0: 55 push %rbp
>> > 115a1: 48 89 e5 mov %rsp,%rbp
>> > 115a4: 41 57 push %r15
>> > 115a6: 41 56 push %r14
>> > 115a8: 41 55 push %r13
>> > 115aa: 41 54 push %r12
>> > 115ac: 53 push %rbx
>> > 115ad: 48 83 ec 78 sub $0x78,%rsp
>> > 115b1: e8 00 00 00 00 callq 115b6 <shrink_zone+0x16>
>> > 115b6: 48 89 75 80 mov %rsi,-0x80(%rbp)
>> >
>> > disassemble seems to show 0x78 bytes for stack. And no changes to %rsp
>> > until retrun.
>>
>> I see the same. I didn't compile those kernels, though. IIUC,
>> they were built through the Ubuntu build infrastructure, so there is
>> something different in terms of compiler, compiler options or config
>> to what we are both using. Most likely it is the compiler inlining,
>> though Chris's patches to prevent that didn't seem to change the
>> stack usage.
>>
>> I'm trying to get a stack trace from the kernel that has shrink_zone
>> in it, but I haven't succeeded yet....
>
> I also got 0x78 byte stack usage. Umm.. Do we discussed real issue now?
>
In my case, 0x110 byte in 32 bit machine.
I think it's possible in 64 bit machine.
00001830 <shrink_zone>:
1830: 55 push %ebp
1831: 89 e5 mov %esp,%ebp
1833: 57 push %edi
1834: 56 push %esi
1835: 53 push %ebx
1836: 81 ec 10 01 00 00 sub $0x110,%esp
183c: 89 85 24 ff ff ff mov %eax,-0xdc(%ebp)
1842: 89 95 20 ff ff ff mov %edx,-0xe0(%ebp)
1848: 89 8d 1c ff ff ff mov %ecx,-0xe4(%ebp)
184e: 8b 41 04 mov 0x4(%ecx)
my gcc is following as.
barrios@barriostarget:~/mmotm$ gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.3.3-5ubuntu4'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-mpfr --enable-targets=all --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4)
Is it depends on config?
I attach my config.
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--
Kind regards,
Minchan Kim
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