[Gluster-devel] xlator/performance.readdir-ahead/readdir.c

[静蒋]

1,The preload  (a readdir request not initiated by application, but
instead triggered by readdir-ahead in an attempt to pre-emptively fill
the read-ahead buffer) is in process,a readdir request from
application waits for its completion. In the code, when the preload is
in progress,it locks the ctx. For applications, the readdir-ahead's
request processing is synchronous, is it possible that the preload
handles request asynchronously by reducing lock granularity? In other
words, the client fetches the dentries from the preload,while the
preload gets the dentries from the servers.

2, when does it can be a lager buffer,like io-cahce,which cached the
data or dentries read before? As you know, ls is so slow.
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