Re: rmap.c: try_to_unmap_file(): VM_LOCKED not respected

[li nux <lnxluv@yahoo.com>]

I first use mmap(MAP_LOCKED) and then
remap_file_pages.
This should set VM_LOCKED in the vma.

-li

--- William Lee Irwin III <wli@holomorphy.com> wrote:

> On Mon, Jun 13, 2005 at 10:14:05PM -0700, li nux
> wrote:
> > My application is using remap_file_pages and
> mlocks
> > those pages.
> > So in the code of  try_to_unmap_file (see below),
> > I should never reach the call to
> try_to_unmap_cluster,
> > because for those pages VM_LOCKED is always set.
> > But, under heavy load I am seeing
> try_to_unmap_cluster
> > is getting called. Stack:
> 
> Does your app use remap_file_pages() before mlock()?
> 
> If so, the VM may be trying to reclaim pages between
> the call to
> remap_file_pages() and the call to mlock().
> 
> 
> -- wli
> -
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