On Mon, 2014-09-22 at 11:26 +0300, Laurentiu Tudor wrote: > On 09/19/2014 11:19 PM, Scott Wood wrote: > > On Fri, 2014-09-19 at 15:16 -0500, Scott Wood wrote: > >> On Thu, 2014-09-18 at 18:26 +1000, Michael Neuling wrote: > >>> From: Ian Munsie <imun...@au1.ibm.com> > >>> > >>> Currently msi_bitmap_alloc_hwirqs() will round up any IRQ allocation > >>> requests > >>> to the nearest power of 2. eg. ask for 5 IRQs and you'll get 8. This > >>> wastes a > >>> lot of IRQs which can be a scarce resource. > >>> > >>> For cxl we can require multiple IRQs for every contexts that is attached > >>> to the > >>> accelerator. For AFU directed accelerators, there may be 1000s of > >>> contexts > >>> attached, hence we can easily run out of IRQs, especially if we are > >>> needlessly > >>> wasting them. > >>> > >>> This changes the msi_bitmap_alloc_hwirqs() to allocate only the required > >>> number > >>> of IRQs, hence avoiding this wastage. > >>> > >>> Signed-off-by: Ian Munsie <imun...@au1.ibm.com> > >>> Signed-off-by: Michael Neuling <mi...@neuling.org> > >>> --- > >>> arch/powerpc/sysdev/msi_bitmap.c | 18 +++++++++++++----- > >>> 1 file changed, 13 insertions(+), 5 deletions(-) > >> > >> This conflicts with (and partially duplicates) > >> http://patchwork.ozlabs.org/patch/381892/ > >> which I have in my tree. How should we handle it? > >> > >> Laurentiu, from looking at the overlap between patches I see a problem > >> with your existing patch, regarding the out-of-irqs path and > >> msi_bitmap_free_hwirqs(), so one way or another that needs to get fixed > >> soon. > > > > Given the problems with Laurentiu's patch, perhaps it'd be best for me > > to just revert that patch in my tree, and respin it after this patchset > > has been merged. > > Let me know if you want me to rebase my stuff on top of Michael's patch.
Yes, please resend it once Michael's patch gets merged. -Scott -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
