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XrIxDBBmP7nkIgl52yNI2Wnvl6qGnLS70JEdGZCtWcxEb1zq0lpxKBiJBCR/6aBcy/h5OJ6R5YICoI23cs7mOUHB4qEHmdBM2oqIdALmhwsUD9THeCrNrDZQZnrEwh7F0GR2EyQD7zuNNlPtMzApugD88B3PAcy7SgWGVbRJaMOpbd0LSKtMnNAv9IQ2Zl9Rb1oPeyodKxzVLCYwE0nqRZRnHqtbh13Fg8VqF7sQQZVe7aqOWCUwcZHQjevbnDL9Na3L8gpU/rytuBBrnCTOvpQ7aZKGGpIYTLlKMm8pBNENMcIXRTmJKglEg6RPf7Z1Uk9U19BY7zyNgah5xX9PIu7hRWIMsUcTAyn0/eocVDwO5nCH10B4D5uTh0t+/GQwmUs+zjJY5v2liitYSIynNYbCrAd/QjVaTWxys6EvHeWB0uC7CxnN4PCi4QPEqhgjBw5ssOFORwAQCIC8UKlH/CeWq4A== 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: On Sun Jan 19, 2025 at 7:38 PM EST, Barry Song wrote: > On Mon, Jan 20, 2025 at 1:26=E2=80=AFPM Zi Yan wrote: >> >> On 19 Jan 2025, at 19:17, Barry Song wrote: >> >> > On Sat, Jan 18, 2025 at 12:00=E2=80=AFPM Juan Yescas wrote: >> >> >> >> + iamjoonsoo.kim@lge.com >> >> + quic_charante@quicinc.com >> >> >> >> On Fri, Jan 17, 2025 at 2:52=E2=80=AFPM Juan Yescas wrote: >> >>> >> >>> +Suren Baghdasaryan >> >>> +Kalesh Singh >> >>> +T.J. Mercier >> >>> +Isaac Manjarres >> >>> >> >>> On Fri, Jan 17, 2025 at 2:51=E2=80=AFPM Juan Yescas wrote: >> >>>> >> >>>> Hi Linux memory team >> >>>> >> >>>> When the drivers reserve CMA memory in 16KiB kernels, the minimum >> >>>> alignment is 32 MiB as per CMA_MIN_ALIGNMENT_BYTES. However, in 4Ki= B >> >>>> kernels, the CMA alignment is 4MiB. >> >>>> >> >>>> This is forcing the drivers to reserve more memory in 16KiB kernels= , >> >>>> even if they only require 4MiB or 8MiB. >> >>>> >> >>>> reserved-memory { >> >>>> #address-cells =3D <2>; >> >>>> #size-cells =3D <2>; >> >>>> ranges; >> >>>> tpu_cma_reserve: tpu_cma_reserve { >> >>>> compatible =3D "shared-dma-pool"; >> >>>> reusable; >> >>>> size =3D <0x0 0x2000000>; /* 32 MiB */ >> >>>> } >> >>>> >> >>>> One workaround to continue using 4MiB alignment is: >> >>>> >> >>>> - Disable CONFIG_TRANSPARENT_HUGEPAGE so the buddy allocator does N= OT >> >>>> have to allocate huge pages (32 MiB in 16KiB page sizes) >> >>>> - Set ARCH_FORCE_MAX_ORDER for ARM64_16K_PAGES to "8", instead of >> >>>> "11", so CMA_MIN_ALIGNMENT_BYTES is equals to 4 MiB >> >>>> >> >>>> config ARCH_FORCE_MAX_ORDER >> >>>> int >> >>>> default "13" if ARM64_64K_PAGES >> >>>> default "8" if ARM64_16K_PAGES >> >>>> default "10" >> >>>> >> >>>> #define MAX_PAGE_ORDER CONFIG_ARCH_FORCE_MAX_ORDER // 8 >> >>>> #define pageblock_order MAX_PAGE_ORDER // 8 >> >>>> #define pageblock_nr_pages (1UL << pageblock_order) // 256 >> >>>> #define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages // 256 >> >>>> #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGE= S) >> >>>> // 16384 * 256 =3D 4194304 =3D 4 MiB >> >>>> >> >>>> After compiling the kernel with this changes, the kernel boots with= out >> >>>> warnings and the memory is reserved: >> >>>> >> >>>> [ 0.000000] Reserved memory: created CMA memory pool at >> >>>> 0x000000007f800000, size 8 MiB >> >>>> [ 0.000000] OF: reserved mem: initialized node tpu_cma_reserve, >> >>>> compatible id shared-dma-pool >> >>>> [ 0.000000] OF: reserved mem: >> >>>> 0x000000007f800000..0x000000007fffffff (8192 KiB) map reusable >> >>>> tpu_cma_reserve >> >>>> >> >>>> # uname -a >> >>>> Linux buildroot 6.12.9-dirty >> >>>> # zcat /proc/config.gz | grep ARM64_16K >> >>>> CONFIG_ARM64_16K_PAGES=3Dy >> >>>> # zcat /proc/config.gz | grep TRANSPARENT_HUGE >> >>>> CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=3Dy >> >>>> # CONFIG_TRANSPARENT_HUGEPAGE is not set >> >>>> # cat /proc/pagetypeinfo >> >>>> Page block order: 8 >> >>>> Pages per block: 256 >> >>>> >> >>>> Free pages count per migrate type at order 0 1 2 >> >>>> 3 4 5 6 7 8 >> >>>> Node 0, zone DMA, type Unmovable 1 1 13 >> >>>> 6 5 2 0 0 1 >> >>>> Node 0, zone DMA, type Movable 9 16 19 >> >>>> 13 13 5 2 0 182 >> >>>> Node 0, zone DMA, type Reclaimable 0 1 0 >> >>>> 1 1 0 0 1 0 >> >>>> Node 0, zone DMA, type HighAtomic 0 0 0 >> >>>> 0 0 0 0 0 0 >> >>>> Node 0, zone DMA, type CMA 1 0 0 >> >>>> 0 0 0 0 0 49 >> >>>> Node 0, zone DMA, type Isolate 0 0 0 >> >>>> 0 0 0 0 0 0 >> >>>> Number of blocks type Unmovable Movable Reclaimable >> >>>> HighAtomic CMA Isolate >> >>>> Node 0, zone DMA 6 199 1 >> >>>> 0 50 0 >> >>>> >> >>>> >> >>>> However, with this workaround, we can't use transparent huge pages. >> > >> > I don=E2=80=99t think this is accurate. You can still use mTHP with a = size >> > equal to or smaller than 4MiB, >> > right? >> > >> > By the way, what specific regression have you observed when reserving >> > a larger size like >> > 32MB? >> > For CMA, the over-reserved memory is still available to the system for >> > movable folios. 28MiB >> >> The fallbacks table does not have MIGRATE_CMA as a fallback for any >> migratetype. How can it be used for movable folios? Am I missing somethi= ng? > > The whole purpose of CMA is to allow the memory reserved for a > device's dma_alloc_coherent or other contiguous memory needs to > be freely used by movable allocations when the device doesn't > require it. When the device's DMA needs the memory, the movable > folios can be migrated to make it available for the device. > > /* Must be called after current_gfp_context() which can change gfp_mask *= / > static inline unsigned int gfp_to_alloc_flags_cma(gfp_t gfp_mask, > unsigned int alloc_flag= s) > { > #ifdef CONFIG_CMA > if (gfp_migratetype(gfp_mask) =3D=3D MIGRATE_MOVABLE) > alloc_flags |=3D ALLOC_CMA; > #endif > > return alloc_flags; > } > > So there=E2=80=99s no waste here. cma can be used by normal buddy. Ah, you are right. I missed the above code, which adds ALLOC_CMA. I agree with you that there is no waste unless the system has a heavy use of unmovable data. --=20 Best Regards, Yan, Zi