Messages in this thread | | | From | Ian Campbell <> | Date | Thu, 21 Feb 2008 22:12:36 +0000 | Subject | Re: 2.6.25-rc1 xen pvops regression |
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On Thu, 2008-02-21 at 13:37 -0800, Jeremy Fitzhardinge wrote: > H. Peter Anvin wrote: > >> Still curious about why a pagetable page is ending up in that range > >> though. Seems like it shouldn't be possible, since we shouldn't be > >> allowed to allocate from those pages, at least until the DMI probe > >> has happened... Unless the early allocator is only excluded from > >> e820 reserved pages, which would cause a problem on systems which > >> don't reserve the DMI space... HPA? > >> > > > > I thought the problem was a Xen-provided pagetable from before Linux > > started? > > Hm, I don't think so. The domain-builder pagetable is put after the > kernel, so it shouldn't be under 1M.
I can confirm that it is Linux which is allocating it. The call path: # xm create -c debian-x86_32p-1 Using config file "/etc/xen/debian-x86_32p-1". Started domain debian-1 xen_alloc_pt_init PFN f0 Pid: 0, comm: swapper Not tainted 2.6.25-rc2 #68 [<c02ecb6b>] xen_alloc_pt_init+0x4b/0x60 [<c02f5e2b>] one_page_table_init+0x8b/0xf0 [<c02f63df>] paging_init+0x3bf/0x520 [<c02ee444>] setup_arch+0x2a4/0x410 [<c02e9a64>] start_kernel+0x64/0x380 [<c02efd7f>] cpu_detect+0x6f/0xf0 [<c02ed1a1>] xen_start_kernel+0x2f1/0x310 ======================= Entering add_active_range(0, 0, 262144) 0 entries of 256 used Zone PFN ranges: DMA 0 -> 4096
Ian. > > J > -- Ian Campbell
Why do they call a fast a fast, when it goes so slow?
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