kernel.git/arch/tile/mm/fault.c, branch linux-3.5.y

tile/mm/fault.c: Port OOM changes to handle_page_fault

2012-05-25T16:48:29Z

Commit d065bd810b6deb67d4897a14bfe21f8eb526ba99 (mm: retry page fault when blocking on disk transfer) and commit 37b23e0525d393d48a7d59f870b3bc061a30ccdb (x86,mm: make pagefault killable) The above commits introduced changes into the x86 pagefault handler for making the page fault handler retryable as well as killable. These changes reduce the mmap_sem hold time, which is crucial during OOM killer invocation. Port these changes to tile. Signed-off-by: Kautuk Consul [cmetcalf@tilera.com: initialize "flags" after "write" updated.] Signed-off-by: Chris Metcalf

arch/tile: support multiple huge page sizes dynamically

2012-05-25T16:48:27Z

This change adds support for a new "super" bit in the PTE, using the new arch_make_huge_pte() method. The Tilera hypervisor sees the bit set at a given level of the page table and gangs together 4, 16, or 64 consecutive pages from that level of the hierarchy to create a larger TLB entry. One extra "super" page size can be specified at each of the three levels of the page table hierarchy on tilegx, using the "hugepagesz" argument on the boot command line. A new hypervisor API is added to allow Linux to tell the hypervisor how many PTEs to gang together at each level of the page table. To allow pre-allocating huge pages larger than the buddy allocator can handle, this change modifies the Tilera bootmem support to put all of memory on tilegx platforms into bootmem. As part of this change I eliminate the vestigial CONFIG_HIGHPTE support, which never worked anyway, and eliminate the hv_page_size() API in favor of the standard vma_kernel_pagesize() API. Signed-off-by: Chris Metcalf

arch/tile: don't enable irqs unconditionally in page fault handler

2012-04-02T16:13:09Z

If we took a page fault while we had interrupts disabled, we shouldn't enable them in the page fault handler. Signed-off-by: Chris Metcalf

arch/tile: don't wait for migrating PTEs in an NMI handler

2012-04-02T16:13:02Z

Doing so raises the possibility of self-deadlock if we are waiting for a backtrace for an oprofile or perf interrupt while we are in the middle of migrating our own stack page. Signed-off-by: Chris Metcalf

arch/tile: fix a couple of comments that needed updating

2012-04-02T16:12:55Z

Not associated with any code changes, so I'm just lumping these comment changes into a commit by themselves. Signed-off-by: Chris Metcalf

Disintegrate asm/system.h for Tile

2012-03-28T17:30:03Z

Disintegrate asm/system.h for Tile. Signed-off-by: David Howells Acked-by: Chris Metcalf

tile: Make tile use the new is_idle_task() API

2011-12-11T18:31:55Z

Change from direct comparison of ->pid with zero to is_idle_task(). Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett Acked-by: Chris Metcalf

arch/tile: support signal "exception-trace" hook

2011-05-20T02:55:59Z

This change adds support for /proc/sys/debug/exception-trace to tile. Like x86 and sparc, by default it is set to "1", generating a one-line printk whenever a user process crashes. By setting it to "2", we get a much more complete userspace diagnostic at crash time, including a user-space backtrace, register dump, and memory dump around the address of the crash. Some vestiges of the Tilera-internal version of this support are removed with this patch (the show_crashinfo variable and the arch_coredump_signal function). We retain a "crashinfo" boot parameter which allows you to set the boot-time value of exception-trace. Signed-off-by: Chris Metcalf

arch/tile: support TIF_NOTIFY_RESUME

2011-05-02T22:53:35Z

This support is required for CONFIG_KEYS, NFSv4 kernel DNS, etc. The change is slightly more complex than the minimal thing, since I took advantage of having to go into the assembly code to just move a bunch of stuff into C code: specifically, the schedule(), do_async_page_fault(), do_signal(), and single_step_once() support, in addition to the TIF_NOTIFY_RESUME support. Signed-off-by: Chris Metcalf

Fix common misspellings

2011-03-31T14:26:23Z

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi