Arjan van de Ven a écrit :
On Thu, 2005-08-25 at 10:45 +0200, Eric Dumazet wrote:
This patch removes filp_count_lock spinlock, used to protect
files_stat.nr_files.
Just use atomic_t type and atomic_inc()/atomic_dec() operations.
This patch assumes that atomic_read() is a plain {return v->counter;} on all
architectures. (keywords : sysctl, /proc/sys/fs/file-nr, proc_dointvec)
this patch adds atomic ops where there were none before
nope... a spinlock/spinunlock contains atomic ops.
for those architectures that need atomics for read (parisc? arm?)
not today. No atomic needed for read.
however.. wouldn't it be better to make this a per cpu variable for
write, and for read iterate or do something smart otherwise?
So on a machine with 256 CPUS, you want to iterate 256 counters ?
nr_files is not heavily touched, no need to expand it.
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