[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] Allow max_pages to be set to less than tot_pages
The memory allocation code sometimes needs to enforce that a guest that's been told to balloon down isn't going to expand further (because it's still executing a previous balloon-up operation). That means being able to set the desired max_pages even before the balloon driver has brought tot_pages down to the right level. Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx> diff -r 95226c6fe89b xen/common/domctl.c --- a/xen/common/domctl.c Mon Jun 01 11:31:38 2009 +0100 +++ b/xen/common/domctl.c Mon Jun 01 15:41:41 2009 +0100 @@ -675,11 +675,11 @@ new_max = op->u.max_mem.max_memkb >> (PAGE_SHIFT-10); spin_lock(&d->page_alloc_lock); - if ( new_max >= d->tot_pages ) - { - d->max_pages = new_max; - ret = 0; - } + /* N.B. We removed a check that new_max >= current tot_pages; + * this means the domain will "ratchet" down to new_max. + * In the meantime tot will be > max. */ + d->max_pages = new_max; + ret = 0; spin_unlock(&d->page_alloc_lock); max_mem_out: _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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