Re: [PATCH] stop page_state stack waste

[Hugh Dickins]

On Tue, 8 Jun 2004, Andrew Morton wrote:
> Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
> >
> > Replace get_page_state (which memset most of full page_state to 0) by
> > get_main_page_state, which just sets the small structure needed.  This
> > helps 4k stacks not to overflow: cuts 224 bytes off try_to_free_pages
> > and wakeup_bdflush (and sync_inodes_sb) stack usages: wakeup_bdflush
> > doesn't do much, but is called by try_to_free_pages and mempool_alloc.
> 
> Yeah, I was looking at that.  I simply did:
> -} ____cacheline_aligned;
> +};

Well, that is a smaller patch; but you're still wasting 124 bytes of
stack in wakeup_bdflush below 124 bytes wasted in try_to_free_pages.

Hugh

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