Re: [RFC/RFT][PATCH -mm] swsusp: improve memory shrinking

[Pavel Machek]

On Po 27-02-06 00:32:24, Rafael J. Wysocki wrote:
> Hi,
> 
> On Sunday 26 February 2006 19:53, Pavel Machek wrote:
> > > > > > I did try shrink_all_memory() five times, with .5 second delay between
> > > > > > them, and it freed more memory at later tries.
> > > > > 
> > > > > I wonder if the delays are essential or if so, whether they may be shorter
> > > > > than .5 sec.
> > > > 
> > > > I was using this with some success... (Warning, against old
> > > > kernel). But, as I said, I consider it ugly, and it would be better to
> > > > fix shrink_all_memory.
> > > 
> > > Appended is a patch against the current -mm.
> > >   [It also makes
> > > swsusp_shrink_memory() behave as documented for image_size = 0.
> > > Currently, if it states there's enough free RAM to suspend, it won't bother
> > > to free a single page.]
> > 
> > Could we get bugfix part separately?
> 
> Sure.  Appended is the bugfix (I haven't tested it separately yet, but I think
> it's simple enough) ...

Are you sure? The way I read old code ... it looks correct to me.

size is always > 1000 or so. if image_size = 0, size >
image_size/PAGE_SIZE and we'll loop as long as shrink_all_memory()
frees something.

								Pavel

        printk("Shrinking memory...  ");
        do {
                /* size = How much memory would we need if we did not
free anything? */
                size = 2 * count_highmem_pages();
                size += size / 50 + count_data_pages();
                size += (size + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
                        PAGES_FOR_IO;

                /* tmp = How much memory do we *need* to free in order
to fit? */
                tmp = size;
                for_each_zone (zone)
                        if (!is_highmem(zone))
                                tmp -= zone->free_pages;
                if (tmp > 0) {
                        tmp = shrink_all_memory(SHRINK_BITE);
                        if (!tmp)
                                return -ENOMEM;
                        pages += tmp;
                } else if (size > image_size / PAGE_SIZE) {
                        tmp = shrink_all_memory(SHRINK_BITE);
                        pages += tmp;
                }
                printk("\b%c", p[i++%4]);



-- 
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