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Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch

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From: Michael Trimarchi
Subject: Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch
Date: Tuesday, September 16, 2008 - 6:57 am

Hi,




 i was thinking about introducing a file_pos_update() not implemented using 
file_pos_read()/file_pos_write() and taking the seq_lock or 
disabling preemption only one time

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From: Nick Piggin
Subject: Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch
Date: Tuesday, September 16, 2008 - 7:11 am

AFAIK, the only way to do an atomic 64 bit store on 32-bit x86 is
"cmpxchg8b" (with lock prefix on SMP). That would be far slower
I'm sure.
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Previous thread: motherboard recommendations? by Jacek Poplawski on Tuesday, September 16, 2008 - 6:57 am. (10 messages)

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