On Wednesday 12 April 2006 03:06, Rafael J. Wysocki wrote:
> The patch is appended.
>
> In shrink_all_memory() I try to free exactly as many pages as the caller
> asks for, preferably in one shot, starting from easier targets. If slabs
> are huge, they are most likely to have enough pages to reclaim. The
> inactive lists are next (the zones with more inactive pages go first) etc.
> However, since each pass potentially requires more work, the number of
> pages to scan is decreased as the pages are reclaimed which seems to make
> the shrinking of memory go more smoothly.
>
> I've been testing it on an x86_64 box for some time and it seems to behave
> quite reasonably, eg. it usually makes the actual image size very close to
> the value of image_size and if you set image_size to 0, it shrinks
> everything almost totally.
Great. Looks pretty good. See comments.
> ---
> #ifdef CONFIG_PM
> /*
> - * Try to free `nr_pages' of memory, system-wide. Returns the number of
> freed - * pages.
> + * Helper function for shrink_all_memory(). Tries to reclaim 'nr_pages'
> pages + * from LRU lists system-wide, for given pass and priority, and
> returns the + * number of reclaimed pages
> + *
> + * For pass > 3 we also try to shrink the LRU lists that contain a few
> pages + */
> +unsigned long shrink_all_zones(unsigned long nr_pages, int pass, int prio,
> + struct scan_control *sc)
I like how this moves all suspend vm functions out of the generic functions
even more than I managed to.
> + int swappiness = vm_swappiness, pass;
> + struct reclaim_state reclaim_state;
> + struct zone *zone;
> + struct scan_control sc = {
> + .gfp_mask = GFP_KERNEL,
> + .may_swap = 1,
> + .swap_cluster_max = nr_pages,
> + .may_writepage = 1,
> };
This is not quite right at maintaining the original semantics I was proposing.
Since you are iterating over all priorities, setting may_swap means you will
reclaim mapped ram on the earlier passes once priority gets low enough.
Setting vm_swappiness temporarily to 100 is unncecessary. You should set
may_swap to 0 and set it to 1 on passes 3+.
Otherwise, looks good, thanks!
--
-ck
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