Re: overcommit verses MAP_NORESERVE

[Alan Cox]

On Llu, 2005-08-08 at 00:22 -0700, Nicholas Miell wrote:
> I don't think you can forcibly reclaim MAP_NORESERVE objects (I'm
> assuming you mean completely throwing away dirty pages).

In which case there is no real difference between MAP_NORESERVE and not
setting it when doing zero overcommit as we do the accounting currently.


> not other errors) and individual writes to unallocated pages in a
> MAP_NORESERVE region should either allocate a new page if possible or
> send a SIGSEGV without triggering the OOM killer.

You'd need to track vma cost seperately which we don't do now and adjust
it for such mappings in the page faulting cases. Certainly practical -
send a patch

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/