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| Started by | Julien Grall <julien.grall@citrix.com> |
|---|---|
| First post | 2015-08-06 17:50 +0200 |
| Last post | 2015-08-06 17:50 +0200 |
| Articles | 1 — 1 participant |
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Re: [Xen-devel] [PATCH v2 13/20] xen/events: fifo: Make it running on 64KB granularity Julien Grall <julien.grall@citrix.com> - 2015-08-06 17:50 +0200
| From | Julien Grall <julien.grall@citrix.com> |
|---|---|
| Date | 2015-08-06 17:50 +0200 |
| Subject | Re: [Xen-devel] [PATCH v2 13/20] xen/events: fifo: Make it running on 64KB granularity |
| Message-ID | <pUvAC-4Wc-11@gated-at.bofh.it> |
Hi David, On 24/07/15 11:36, David Vrabel wrote: > On 09/07/15 21:42, Julien Grall wrote: >> Only use the first 4KB of the page to store the events channel info. It >> means that we will wast 60KB every time we allocate page for: >> * control block: a page is allocating per CPU >> * event array: a page is allocating everytime we need to expand it > > Reviewed-by: David Vrabel <david.vrabel@citrix.com> Thank you! >> >> I think we can reduce the memory waste for the 2 areas by: >> >> * control block: sharing between multiple vCPUs. Although it will >> require some bookkeeping in order to not free the page when the CPU >> goes offline and the other CPUs sharing the page still there >> >> * event array: always extend the array event by 64K (i.e 16 4K >> chunk). That would require more care when we fail to expand the >> event channel. > > I would extend it by 4 KiB each time but only allocate a new page every > 16 times. This minimizes the resources used in Xen. I will keep it in mind when I will send a patch to reduce memory waster. Regards, -- Julien Grall -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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