yunfeng zhang wrote:
> My patch is based on my new idea to Linux swap subsystem, you can find
> more in Documentation/vm_pps.txt which isn't only patch illustration but
> also file changelog. In brief, SwapDaemon should scan and reclaim pages on
> UserSpace::vmalist other than current zone::active/inactive. The change
> will conspicuously enhance swap subsystem performance by
>
> 1) SwapDaemon can collect the statistic of process acessing pages and by
> it unmaps ptes, SMP specially benefits from it for we can use
> flush_tlb_range to unmap ptes batchly rather than frequently TLB IPI
> interrupt per a page in current Linux legacy swap subsystem.
> 2) Page-fault can issue better readahead requests since history data shows
> all related pages have conglomerating affinity. In contrast, Linux
> page-fault readaheads the pages relative to the SwapSpace position of
> current page-fault page.
> 3) It's conformable to POSIX madvise API family.
> 4) It simplifies Linux memory model dramatically. Keep it in mind that new
> swap strategy is from up to down. In fact, Linux legacy swap subsystem is
> maybe the only one from down to up.
>
> Other problems asked about my pps are
> 1) There isn't new lock order in my pps, it's compliant to Linux lock
> order defined in mm/rmap.c.
> 2) When a memory inode is low, you can set scan_control::reclaim_node to
> let my kppsd to reclaim the memory inode page.
Patched against 2.6.19 leads to:
mm/vmscan.c: In function `shrink_pvma_scan_ptes':
mm/vmscan.c:1340: too many arguments to function `page_remove_rmap'
So changed
page_remove_rmap(series.pages[i], vma);
to
page_remove_rmap(series.pages[i]);
But your patch doesn't offer any swap-performance improvement for both swsusp
or tmpfs. Swap-in is still half speed of Swap-out.
Thanks!
--
Al
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