search for: highmem

Add an highmem parameter to alloc_xenballooned_pages, to allow callers to request lowmem or highmem pages. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> --- drivers/xen/balloon.c | 12 ++++++++---- drivers/xen/gntdev.c | 2 +- include/xen/balloon.h | 3 ++- 3 files changed,...

Now that the kmap atomic index is stored in task struct provide a preemptible variant. On context switch the maps of an outgoing task are removed and the map of the incoming task are restored. That's obviously slow, but highmem is slow anyway. The kmap_local.*() functions can be invoked from both preemptible and atomic context. kmap local sections disable migration to keep the resulting virtual mapping address correct, but disable neither pagefaults nor preemption. A wholesale conversion of kmap_atomic to be fully preem...

...need to translate high virtual addresses to physical addresses, which are inserted into the virtqueue for processing by userspace. This patch exports the kmap_to_page symbol, so that the affected drivers can be compiled as modules. Signed-off-by: Will Deacon <will.deacon at arm.com> --- mm/highmem.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/mm/highmem.c b/mm/highmem.c index d517cd1..2a07f97 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -105,6 +105,7 @@ struct page *kmap_to_page(void *vaddr) return virt_to_page(addr); } +EXPORT_SYMBOL(kmap_to_page); st...

...need to translate high virtual addresses to physical addresses, which are inserted into the virtqueue for processing by userspace. This patch exports the kmap_to_page symbol, so that the affected drivers can be compiled as modules. Signed-off-by: Will Deacon <will.deacon at arm.com> --- mm/highmem.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/mm/highmem.c b/mm/highmem.c index d517cd1..2a07f97 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -105,6 +105,7 @@ struct page *kmap_to_page(void *vaddr) return virt_to_page(addr); } +EXPORT_SYMBOL(kmap_to_page); st...

...ix.de> Cc: Nick Hu <nickhu at andestech.com> Cc: Greentime Hu <green.hu at gmail.com> Cc: Vincent Chen <deanbo422 at gmail.com> --- V3: Remove the kmap types cruft --- arch/nds32/Kconfig.cpu | 1 arch/nds32/include/asm/fixmap.h | 4 +-- arch/nds32/include/asm/highmem.h | 22 +++++++++++++---- arch/nds32/mm/Makefile | 1 arch/nds32/mm/highmem.c | 48 --------------------------------------- 5 files changed, 19 insertions(+), 57 deletions(-) --- a/arch/nds32/Kconfig.cpu +++ b/arch/nds32/Kconfig.cpu @@ -157,6 +157,7 @@ config HW_SUPPORT_...

All users gone. Signed-off-by: Thomas Gleixner <tglx at linutronix.de> --- include/linux/highmem.h | 63 +++--------------------------------------------- mm/highmem.c | 7 ----- 2 files changed, 5 insertions(+), 65 deletions(-) --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -86,31 +86,16 @@ static inline void kunmap(struct page *p * be used in IRQ contexts, s...

...tronix.de> Cc: Russell King <linux at armlinux.org.uk> Cc: Arnd Bergmann <arnd at arndb.de> Cc: linux-arm-kernel at lists.infradead.org --- V3: Remove the kmap types cruft --- arch/arm/Kconfig | 1 arch/arm/include/asm/fixmap.h | 4 - arch/arm/include/asm/highmem.h | 33 +++++++--- arch/arm/include/asm/kmap_types.h | 10 --- arch/arm/mm/Makefile | 1 arch/arm/mm/highmem.c | 121 -------------------------------------- 6 files changed, 26 insertions(+), 144 deletions(-) --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -14...

Assumes hypervisor interface headers have been sync-ed after the hypervisor side patch was applied. As usual, written and tested on 2.6.27.3 and made apply to the 2.6.18 tree without further testing. Signed-off-by: Jan Beulich <jbeulich@novell.com> Index: head-2008-10-24/arch/i386/mm/highmem-xen.c =================================================================== --- head-2008-10-24.orig/arch/i386/mm/highmem-xen.c 2008-10-27 11:56:39.000000000 +0100 +++ head-2008-10-24/arch/i386/mm/highmem-xen.c 2008-10-27 11:56:59.000000000 +0100 @@ -151,9 +151,56 @@ struct page *kmap_atomic_to_page(...

...min Herrenschmidt <benh at kernel.crashing.org> Cc: Paul Mackerras <paulus at samba.org> Cc: linuxppc-dev at lists.ozlabs.org --- V3: Remove the kmap types cruft --- arch/powerpc/Kconfig | 1 arch/powerpc/include/asm/fixmap.h | 4 +- arch/powerpc/include/asm/highmem.h | 7 ++- arch/powerpc/include/asm/kmap_types.h | 13 ------ arch/powerpc/mm/Makefile | 1 arch/powerpc/mm/highmem.c | 67 ---------------------------------- arch/powerpc/mm/mem.c | 7 --- 7 files changed, 8 insertions(+), 92 deletions(-)...

...t linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all kmap atomic implementations in generic code including a useful version of the CONFIG_DEBUG_HIGHMEM which provides guard pages between the individual maps instead of just increasing the map size. - Switching from per CPU storage of the kmap index to a per task storage - Adding a pteval array to the per task storage which contains the ptevals of the currently active temporary kmaps - A...

...t linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all kmap atomic implementations in generic code including a useful version of the CONFIG_DEBUG_HIGHMEM which provides guard pages between the individual maps instead of just increasing the map size. - Switching from per CPU storage of the kmap index to a per task storage - Adding a pteval array to the per task storage which contains the ptevals of the currently active temporary kmaps - A...

...t linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all kmap atomic implementations in generic code including a useful version of the CONFIG_DEBUG_HIGHMEM which provides guard pages between the individual maps instead of just increasing the map size. - Switching from per CPU storage of the kmap index to a per task storage - Adding a pteval array to the per task storage which contains the ptevals of the currently active temporary kmaps - A...

...7 xenu kernel: oom-killer: gfp_mask=0xd0 Aug 22 22:03:37 xenu kernel: DMA per-cpu: Aug 22 22:03:37 xenu kernel: cpu 0 hot: low 32, high 96, batch 16 Aug 22 22:03:37 xenu kernel: cpu 0 cold: low 0, high 32, batch 16 Aug 22 22:03:37 xenu kernel: Normal per-cpu: empty Aug 22 22:03:37 xenu kernel: HighMem per-cpu: empty Aug 22 22:03:37 xenu kernel: Aug 22 22:03:37 xenu kernel: Free pages: 2304kB (0kB HighMem) Aug 22 22:03:37 xenu kernel: Active:2375 inactive:55381 dirty:0 writeback:54298 unstable:1042 free:576 slab:3961 mapped:2375 pagetables:84 Aug 22 22:03:37 xenu kernel: DMA free:2304k...

...el: oom-killer: gfp_mask=0x1d2 Jun 18 08:45:21 lemodev kernel: DMA per-cpu: Jun 18 08:45:21 lemodev kernel: cpu 0 hot: low 32, high 96, batch 16 Jun 18 08:45:21 lemodev kernel: cpu 0 cold: low 0, high 32, batch 16 Jun 18 08:45:21 lemodev kernel: Normal per-cpu: empty Jun 18 08:45:21 lemodev kernel: HighMem per-cpu: empty Jun 18 08:45:21 lemodev kernel: Jun 18 08:45:21 lemodev kernel: Free pages: 2392kB (0kB HighMem) Jun 18 08:45:21 lemodev kernel: Active:28322 inactive:28202 dirty:0 writeback:0 unstable:0 free:598 slab:5532 mapped:56227 Jun 18 08:45:21 lemodev kernel: DMA free:2392kB min:2048k...

...[<c02eeedd>] schedule+0x3bd/0x680 [<c0124929>] sys_alarm+0x39/0x60 [<c0114eb0>] do_page_fault+0x0/0x66a [<c0108c17>] error_code+0x2b/0x30 lowmem_reserve[]: 0 0 0 DMA: 1*4kB 0*8kB 0*16kB 1*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 548kB Normal: empty HighMem: empty Swap cache: add 120470, delete 120465, find 45260/94674, race 0+2 Free swap = 2096316kB Total swap = 2096376kB oom-killer: gfp_mask=0x1d2 DMA per-cpu: cpu 0 hot: low 30, high 90, batch 15 cpu 0 cold: low 0, high 30, batch 15 Normal per-cpu: empty HighMem per-cpu: empty Free pages:...

On Tue, Nov 3, 2020 at 2:33 AM Thomas Gleixner <tglx at linutronix.de> wrote: > > +static inline void *kmap(struct page *page) > +{ > + void *addr; > + > + might_sleep(); > + if (!PageHighMem(page)) > + addr = page_address(page); > + else > + addr = kmap_high(page); > + kmap_flush_tlb((unsigned long)addr); > + return addr; > +} > + > +static inline void kunmap(struct page *page) > +{ > + might_sleep(); &gt...

...slots depending on configuration. The total slots have to be divided by the number of CPUs to get the number of slots per CPU (former KM_TYPE_NR). ARC supports up to 4k CPUs, so this just falls apart in random ways depending on the number of CPUs and the actual kmap (atomic) nesting. The comment in highmem.c: * - fixmap anyhow needs a limited number of mappings. So 2M kvaddr == 256 PTE * slots across NR_CPUS would be more than sufficient (generic code defines * KM_TYPE_NR as 20). is just wrong. KM_TYPE_NR (now KM_MAX_IDX) is the number of slots per CPU because kmap_local/atomic() needs to su...

...ff-by: Thomas Gleixner <tglx at linutronix.de> Cc: Thomas Bogendoerfer <tsbogend at alpha.franken.de> Cc: linux-mips at vger.kernel.org --- V3: Remove the kmap types cruft --- arch/mips/Kconfig | 1 arch/mips/include/asm/fixmap.h | 4 - arch/mips/include/asm/highmem.h | 6 +- arch/mips/include/asm/kmap_types.h | 13 ------ arch/mips/mm/highmem.c | 77 ------------------------------------- arch/mips/mm/init.c | 4 - 6 files changed, 6 insertions(+), 99 deletions(-) --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2719...

Move the gory details of kmap & al into a private header and only document the interfaces which are usable by drivers. Signed-off-by: Thomas Gleixner <tglx at linutronix.de> --- V3: New patch --- include/linux/highmem-internal.h | 174 +++++++++++++++++++++++++ include/linux/highmem.h | 270 ++++++++++++++------------------------- mm/highmem.c | 11 - 3 files changed, 276 insertions(+), 179 deletions(-) --- /dev/null +++ b/include/linux/highmem-internal.h @@ -0,0 +1,174 @@ +/* S...

Hi all, Just watching for my first time the 'oom-killer' call in a CentOS 4.2 workstation. System was running normally but with high load of nice process, iow, rosetta and seti, others appart, nautilus, etc... i realized that after a night of standby running normally, the next moorning after few manual operations from X-session in local console, it started a massive swapping, this time