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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Gregory Price wrote: > On Tue, Nov 12, 2024 at 01:41:55PM -0800, Dan Williams wrote: > > Gregory Price wrote: > > > Capacity is stranded when CFMWS regions are not aligned to block size. > > > On x86, block size increases with capacity (2G blocks @ 64G capacity). > > > > > > Use CFMWS base/size to report memory block size alignment advice. > > > > > > Suggested-by: Dan Williams > > > Signed-off-by: Gregory Price > > > Acked-by: Mike Rapoport (Microsoft) > > > Acked-by: David Hildenbrand > > > --- > > > drivers/acpi/numa/srat.c | 12 +++++++++++- > > > 1 file changed, 11 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c > > > index 44f91f2c6c5d..34b6993e7d6c 100644 > > > --- a/drivers/acpi/numa/srat.c > > > +++ b/drivers/acpi/numa/srat.c > > > @@ -14,6 +14,7 @@ > > > #include > > > #include > > > #include > > > +#include > > > #include > > > #include > > > #include > > > @@ -338,13 +339,22 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, > > > { > > > struct acpi_cedt_cfmws *cfmws; > > > int *fake_pxm = arg; > > > - u64 start, end; > > > + u64 start, end, align; > > > int node; > > > > > > cfmws = (struct acpi_cedt_cfmws *)header; > > > start = cfmws->base_hpa; > > > end = cfmws->base_hpa + cfmws->window_size; > > > > > > + /* Align memblock size to CFMW regions if possible */ > > > + align = 1UL << __ffs(start | end); > > > + if (align >= SZ_256M) { > > > + if (memory_block_advise_max_size(align) < 0) > > > + pr_warn("CFMWS: memblock size advise failed\n"); > > > > Oh, this made me go back to look at what happens if CFMWS has multiple > > alignment suggestions. Should not memory_block_advise_max_size() be > > considering the max advice? > > > > if (memory_block_advised_size) { > > ... > > } else { > > memory_block_advised_size = max(memory_block_advised_size, size); > > } > > > > For example, if region0 is an x4 region and region1 is an x1 region then > > the memory block size should be 1GB, not 256M. I.e. CFMWS alignment > > follows CXL hardware decoder alignment of "256M * InterleaveWays". > > Max size to minimize capacity loss to due alignment truncation. > > If CFMW-0 is aligned at 1GB and CFMW-1 is aligned at 256MB, if you select 1GB > then some portion of CFMW-1 will be unmappable. > > so you want min(memory_block_advised_size, size) to ensure the hotplug memblock > size aligns to the *smallest* CFMW (or any other source) alignment. > > Unless I'm misunderstanding your feedback here. No, whoops, you didn't misundertand, I just misread memory_block_advise_max_size(). Makes sense and current code looks good, you can add: Acked-by: Dan Williams > I'm not clear on why the interleave data is relevant here - that just tells us > how decoders line up with the memory region described in the CFMW. The window > still gets chopped up into N memblocks of memory_block_advised_size. Yes the window still gets chopped, but the alignment is meant to follow 256M * InterleaveWays. The algorithm as you have it will pick that up. So, no concerns from me from the CXL side.