Hi Li, On Tue, 2016-03-08 at 11:55 +0800, Li Zhang wrote: > From: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx> > > Parallel initialisation has been enabled for X86, boot time is > improved greatly. On Power8, it is improved greatly for small > memory. Here is the result from my test on Power8 platform: > > For 4GB memory: 57% is improved, boot time as the following: > with patch: 10s, without patch: 24.5s This isn't worded quite right, and the numbers are a bit off. old = 24.5 new = 10 So the improvement is 14.5 (seconds). That means the improvement (14.5) as a percentage of the original boot time is: = 14.5 / 24.5 * 100 = 59.183673469387756 = 59% So you would say: For 4GB of memory, boot time is improved by 59%, from 24.5s to 10s. > For 50GB memory: 22% is improved, boot time as the following: > with patch: 43.8s, without patch: 56.8s For 50GB memory, boot time is improved by 22%, from 56.8s to 43.8s. > Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx> > --- > * Add boot time details in change log. > * Please apply this patch after [PATCH 1/2] mm: meminit: initialise > more memory for inode/dentry hash tables in early boot, because > [PATCH 1/2] is to fix a bug which can be reproduced on Power. Given that, I think it would be best if Andrew merged both of these patches. Because this patch is pretty trivial, whereas the patch to mm/ is less so. Is that OK Andrew? For this one: Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> cheers -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>