| Message ID | 20181008100355.31820-1-punit.agrawal@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] Documentation/arm64: HugeTLB page implementation | expand |
On 10/8/18 3:03 AM, Punit Agrawal wrote: > Arm v8 architecture supports multiple page sizes - 4k, 16k and > 64k. Based on the active page size, the Linux port supports > corresponding hugepage sizes at PMD and PUD(4k only) levels. > > In addition, the architecture also supports caching larger sized > ranges (composed of multiple entries) at the PTE and PMD level in the > TLBs using the contiguous bit. The Linux port makes use of this > architectural support to enable additional hugepage sizes. > > Describe the two different types of hugepages supported by the arm64 > kernel and the hugepage sizes enabled by each. > > Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Jonathan Corbet <corbet@lwn.net> Acked-by: Randy Dunlap <rdunlap@infradead.org> Thanks. > --- > Hi, > > This version incorporates the feedback on v1. > > Thanks, > Punit > > Documentation/arm64/hugetlbpage.txt | 38 +++++++++++++++++++++++++++++ > 1 file changed, 38 insertions(+) > create mode 100644 Documentation/arm64/hugetlbpage.txt > > diff --git a/Documentation/arm64/hugetlbpage.txt b/Documentation/arm64/hugetlbpage.txt > new file mode 100644 > index 000000000000..cfae87dc653b > --- /dev/null > +++ b/Documentation/arm64/hugetlbpage.txt > @@ -0,0 +1,38 @@ > +HugeTLBpage on ARM64 > +==================== > + > +Hugepage relies on making efficient use of TLBs to improve performance of > +address translations. The benefit depends on both - > + > + - the size of hugepages > + - size of entries supported by the TLBs > + > +The ARM64 port supports two flavours of hugepages. > + > +1) Block mappings at the pud/pmd level > +-------------------------------------- > + > +These are regular hugepages where a pmd or a pud page table entry points to a > +block of memory. Regardless of the supported size of entries in TLB, block > +mappings reduce the depth of page table walk needed to translate hugepage > +addresses. > + > +2) Using the Contiguous bit > +--------------------------- > + > +The architecture provides a contiguous bit in the translation table entries > +(D4.5.3, ARM DDI 0487C.a) that hints to the MMU to indicate that it is one of a > +contiguous set of entries that can be cached in a single TLB entry. > + > +The contiguous bit is used in Linux to increase the mapping size at the pmd and > +pte (last) level. The number of supported contiguous entries varies by page size > +and level of the page table. > + > + > +The following hugepage sizes are supported - > + > + CONT PTE PMD CONT PMD PUD > + -------- --- -------- --- > + 4K: 64K 2M 32M 1G > + 16K: 2M 32M 1G > + 64K: 2M 512M 16G >
Randy Dunlap <rdunlap@infradead.org> writes: > On 10/8/18 3:03 AM, Punit Agrawal wrote: >> Arm v8 architecture supports multiple page sizes - 4k, 16k and >> 64k. Based on the active page size, the Linux port supports >> corresponding hugepage sizes at PMD and PUD(4k only) levels. >> >> In addition, the architecture also supports caching larger sized >> ranges (composed of multiple entries) at the PTE and PMD level in the >> TLBs using the contiguous bit. The Linux port makes use of this >> architectural support to enable additional hugepage sizes. >> >> Describe the two different types of hugepages supported by the arm64 >> kernel and the hugepage sizes enabled by each. >> >> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> >> Cc: Catalin Marinas <catalin.marinas@arm.com> >> Cc: Will Deacon <will.deacon@arm.com> >> Cc: Jonathan Corbet <corbet@lwn.net> > > Acked-by: Randy Dunlap <rdunlap@infradead.org> Thanks! Catalin, Will - I assume you'll pick this up at some point? Or do arm64 documentation patches get routed by another tree? > > Thanks. > >> --- >> Hi, >> >> This version incorporates the feedback on v1. >> >> Thanks, >> Punit >> >> Documentation/arm64/hugetlbpage.txt | 38 +++++++++++++++++++++++++++++ >> 1 file changed, 38 insertions(+) >> create mode 100644 Documentation/arm64/hugetlbpage.txt >> >> diff --git a/Documentation/arm64/hugetlbpage.txt b/Documentation/arm64/hugetlbpage.txt >> new file mode 100644 >> index 000000000000..cfae87dc653b >> --- /dev/null >> +++ b/Documentation/arm64/hugetlbpage.txt >> @@ -0,0 +1,38 @@ >> +HugeTLBpage on ARM64 >> +==================== >> + >> +Hugepage relies on making efficient use of TLBs to improve performance of >> +address translations. The benefit depends on both - >> + >> + - the size of hugepages >> + - size of entries supported by the TLBs >> + >> +The ARM64 port supports two flavours of hugepages. >> + >> +1) Block mappings at the pud/pmd level >> +-------------------------------------- >> + >> +These are regular hugepages where a pmd or a pud page table entry points to a >> +block of memory. Regardless of the supported size of entries in TLB, block >> +mappings reduce the depth of page table walk needed to translate hugepage >> +addresses. >> + >> +2) Using the Contiguous bit >> +--------------------------- >> + >> +The architecture provides a contiguous bit in the translation table entries >> +(D4.5.3, ARM DDI 0487C.a) that hints to the MMU to indicate that it is one of a >> +contiguous set of entries that can be cached in a single TLB entry. >> + >> +The contiguous bit is used in Linux to increase the mapping size at the pmd and >> +pte (last) level. The number of supported contiguous entries varies by page size >> +and level of the page table. >> + >> + >> +The following hugepage sizes are supported - >> + >> + CONT PTE PMD CONT PMD PUD >> + -------- --- -------- --- >> + 4K: 64K 2M 32M 1G >> + 16K: 2M 32M 1G >> + 64K: 2M 512M 16G >>
On Tue, Oct 09, 2018 at 11:02:01AM +0100, Punit Agrawal wrote: > Randy Dunlap <rdunlap@infradead.org> writes: > > > On 10/8/18 3:03 AM, Punit Agrawal wrote: > >> Arm v8 architecture supports multiple page sizes - 4k, 16k and > >> 64k. Based on the active page size, the Linux port supports > >> corresponding hugepage sizes at PMD and PUD(4k only) levels. > >> > >> In addition, the architecture also supports caching larger sized > >> ranges (composed of multiple entries) at the PTE and PMD level in the > >> TLBs using the contiguous bit. The Linux port makes use of this > >> architectural support to enable additional hugepage sizes. > >> > >> Describe the two different types of hugepages supported by the arm64 > >> kernel and the hugepage sizes enabled by each. > >> > >> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> > >> Cc: Catalin Marinas <catalin.marinas@arm.com> > >> Cc: Will Deacon <will.deacon@arm.com> > >> Cc: Jonathan Corbet <corbet@lwn.net> > > > > Acked-by: Randy Dunlap <rdunlap@infradead.org> > > Thanks! > > Catalin, Will - I assume you'll pick this up at some point? Or do arm64 > documentation patches get routed by another tree? Acked-by: Will Deacon <will.deacon@arm.com> Catalin can pick this up for 4.20. Will
On Tue, Oct 09, 2018 at 12:50:49PM +0100, Will Deacon wrote: > On Tue, Oct 09, 2018 at 11:02:01AM +0100, Punit Agrawal wrote: > > Randy Dunlap <rdunlap@infradead.org> writes: > > > > > On 10/8/18 3:03 AM, Punit Agrawal wrote: > > >> Arm v8 architecture supports multiple page sizes - 4k, 16k and > > >> 64k. Based on the active page size, the Linux port supports > > >> corresponding hugepage sizes at PMD and PUD(4k only) levels. > > >> > > >> In addition, the architecture also supports caching larger sized > > >> ranges (composed of multiple entries) at the PTE and PMD level in the > > >> TLBs using the contiguous bit. The Linux port makes use of this > > >> architectural support to enable additional hugepage sizes. > > >> > > >> Describe the two different types of hugepages supported by the arm64 > > >> kernel and the hugepage sizes enabled by each. > > >> > > >> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> > > >> Cc: Catalin Marinas <catalin.marinas@arm.com> > > >> Cc: Will Deacon <will.deacon@arm.com> > > >> Cc: Jonathan Corbet <corbet@lwn.net> > > > > > > Acked-by: Randy Dunlap <rdunlap@infradead.org> > > > > Thanks! > > > > Catalin, Will - I assume you'll pick this up at some point? Or do arm64 > > documentation patches get routed by another tree? > > Acked-by: Will Deacon <will.deacon@arm.com> > > Catalin can pick this up for 4.20. Done.
diff --git a/Documentation/arm64/hugetlbpage.txt b/Documentation/arm64/hugetlbpage.txt new file mode 100644 index 000000000000..cfae87dc653b --- /dev/null +++ b/Documentation/arm64/hugetlbpage.txt @@ -0,0 +1,38 @@ +HugeTLBpage on ARM64 +==================== + +Hugepage relies on making efficient use of TLBs to improve performance of +address translations. The benefit depends on both - + + - the size of hugepages + - size of entries supported by the TLBs + +The ARM64 port supports two flavours of hugepages. + +1) Block mappings at the pud/pmd level +-------------------------------------- + +These are regular hugepages where a pmd or a pud page table entry points to a +block of memory. Regardless of the supported size of entries in TLB, block +mappings reduce the depth of page table walk needed to translate hugepage +addresses. + +2) Using the Contiguous bit +--------------------------- + +The architecture provides a contiguous bit in the translation table entries +(D4.5.3, ARM DDI 0487C.a) that hints to the MMU to indicate that it is one of a +contiguous set of entries that can be cached in a single TLB entry. + +The contiguous bit is used in Linux to increase the mapping size at the pmd and +pte (last) level. The number of supported contiguous entries varies by page size +and level of the page table. + + +The following hugepage sizes are supported - + + CONT PTE PMD CONT PMD PUD + -------- --- -------- --- + 4K: 64K 2M 32M 1G + 16K: 2M 32M 1G + 64K: 2M 512M 16G
Arm v8 architecture supports multiple page sizes - 4k, 16k and 64k. Based on the active page size, the Linux port supports corresponding hugepage sizes at PMD and PUD(4k only) levels. In addition, the architecture also supports caching larger sized ranges (composed of multiple entries) at the PTE and PMD level in the TLBs using the contiguous bit. The Linux port makes use of this architectural support to enable additional hugepage sizes. Describe the two different types of hugepages supported by the arm64 kernel and the hugepage sizes enabled by each. Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Jonathan Corbet <corbet@lwn.net> --- Hi, This version incorporates the feedback on v1. Thanks, Punit Documentation/arm64/hugetlbpage.txt | 38 +++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/arm64/hugetlbpage.txt