Re: Purging the Page Table (was: Purging the Buffer Cache)

Re: Purging the Page Table (was: Purging the Buffer Cache)

[Al Peat]

--- Juri Haberland <juri.haberland@innominate.com>
wrote:
> Al Peat wrote:
> > 
> >   Is there any way to completely purge the buffer
> > cache -- not just the write requests (ala 'sync'
> or
> > 'update'), but the whole thing?  Can I just call
> > invalidate_buffers() or destroy_buffers()?
>
> What about the ioctl BLKFLSBUF ?
> If you are running a SuSE distrib there is already a
> tool called flushb
> that does what you want. If not, you can download
> the simple tool from
> http://innominate.org/~juri/flushb.tar.gz

  Another question: what if I need to purge the page
table of all files as well?  Is there a clean way to
do that?  I've been looking at /mm/memory.c, but it
doesn't look like clear_page_tables, etc. get
exported.

  I need /all/ read requests to go to disk, and it'd
be nice if I could do that without a reboot (but I'll
take the reboot if that's the only way to go about it
:)

  Thanks again,
  	Al

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Re: Purging the Page Table (was: Purging the Buffer Cache)

[Jamie Lokier]

Al Peat wrote:
> > >   Is there any way to completely purge the buffer
> > > cache -- not just the write requests (ala 'sync'
> > or
> > > 'update'), but the whole thing?  Can I just call
> > > invalidate_buffers() or destroy_buffers()?

Try this script:

case "`id -u`" in
  0) ;;
  *) echo Only root can run this script. 1>&2; exit 1 ;;
esac

mount | sort -k3 -r | \
while read dev ON dir TYPE type etc; do
  echo mount $dir -o remount
  mount $dir -o remount
done

mount | sort -k1 | \
while read dev ON dir TYPE type etc; do
  case "$dev" in
    /dev/*) echo hdparm -f $dev
      hdparm -f $dev >/dev/null ;;
  esac
done

-- Jamie
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