On 05/29/2013 12:56 PM, Andi Kleen wrote:
On Wed, May 29, 2013 at 12:18:09PM -0400, Simo Sorce wrote:
To be honest a workload base on /etc/passwd or /etc/group is completely
artificial, in actual usage, if you really have such access you use
nscd or sssd with their shared memory caches to completely remove most
of the file access.
I don't fully agree at this point. A lot of things can be tuned away,
but in practice we want things to perform well out of the box without
needing all kinds of magic tuning that only
Also this is just normal file access, nothing special about it.
It simply has to scale. For all kinds of workloads.
And it does, just d_path messes it up.
Just for clarification, the AIM7 workload is not affected by the current
d_path() code, they are speed-limited by the lock contention in the
dcache reference counting code. However, both the d_path() change and
the dentry reference counting change are needed to to eliminate the
overhead introduced by the use of the perf-record command.
Regards,
Longman
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