Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?)

Peter Zijlstra
2007-09-28T18:53:18Z

On Fri, 2007-09-28 at 11:49 -0700, Andrew Morton wrote:

> Do you know where the stalls are occurring? throttle_vm_writeout(), or via
> direct calls to congestion_wait() from page_alloc.c and vmscan.c? (running
> sysrq-w five or ten times will probably be enough to determine this)

would it make sense to instrument congestion_wait() callsites with
vmstats?