Messages in this thread | | | From | Minchan Kim <> | Subject | Re: [PATCHv2 00/16] [FS, MM, block, MMC]: eMMC High Priority Interrupt Feature | Date | Mon, 14 May 2012 16:55:39 +0900 |
| |
On 05/14/2012 04:43 PM, mani wrote:
> Dear Kim, > > I have a query here .. > > > My point is that it would be better for read to not preempt > write-for-page_reclaim. > And we can identify it by PG_reclaim. You can get the idea. > > I think If there is no page available then no read will proceed.
> When read request comes it reclaim the pages (starts the write if
> syncable pages ) and get back after reclaiming the pages. > Only then a read request will come to the MMC subsystem.
> And i think the reclaim algorithm will reclaim some substantial amount
> of pages at a time instead of a single page. > So if we get few pages during the reclamation so there will be no > problem in halting the another write ops for proceeding the reads ? > > Can we think of a scenario when we are reclaiming the pages and write > ops is going on where as a high priority read for the interrupt handler > is pending ? > > Please correct me if i am wrong.
For example, System can have lots of order-0 pages but little order-big pages. In this case, for getting big contiguos memory, reclaimer should write out dirty pages while it can handle order-0 page read request.
> > Thanks & Regards > Manish
-- Kind regards, Minchan Kim
| |