- 24 Jun, 2004 10 commits
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Andrew Morton authored
From: Paul Jackson <pj@sgi.com> Document the bitmap bit model and handling of unused bits. Tighten up bitmap so it does not generate nonzero bits in the unused tail if it is not given any on input. Add intersects, subset, xor and andnot operators. Change bitmap_complement to take two operands. Add a couple of missing 'const' qualifiers on bitops test_bit and bitmap_equal args. Signed-off-by:
Paul Jackson <pj@sgi.com> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Andrew Morton authored
From: Paul Jackson <pj@sgi.com> This patch makes cpu_present_map a real map for all configurations, instead of a constant for non-SMP. It also moves the definition of cpu_present_map out of kernel/cpu.c into kernel/sched.c, because cpu.c isn't compiled into non-SMP kernels. The pattern is that each of the possible, present and online cpu maps are actual kernel global cpumask_t variables, for all configurations. They are documented in include/linux/cpumask.h. Some of the UP (NR_CPUS=1) code cheats, and hardcodes the assumption that the single bit position of these maps is always set, as an optimization. Signed-off-by:
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Andrew Morton authored
From: Dipankar Sarma <dipankar@in.ibm.com> This patch changes the call_rcu() API and avoids passing an argument to the callback function as suggested by Rusty. Instead, it is assumed that the user has embedded the rcu head into a structure that is useful in the callback and the rcu_head pointer is passed to the callback. The callback can use container_of() to get the pointer to its structure and work with it. Together with the rcu-singly-link patch, it reduces the rcu_head size by 50%. Considering that we use these in things like struct dentry and struct dst_entry, this is good savings in space. An example : struct my_struct { struct rcu_head rcu; int x; int y; }; void my_rcu_callback(struct rcu_head *head) { struct my_struct *p = container_of(head, struct my_struct, rcu); free(p); } void my_delete(struct my_struct *p) { ... call_rcu(&p->rcu, my_rcu_callback); ... } Signed-Off-By:Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by:
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Andrew Morton authored
From: Dipankar Sarma <dipankar@in.ibm.com> This reduces the RCU head size by using a singly linked to maintain them. The ordering of the callbacks is still maintained as before by using a tail pointer for the next list. Signed-Off-By : Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by:
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Andrew Morton authored
From: Manfred Spraul <manfred@colorfullife.com> Step three for reducing cacheline trashing within rcupdate.c: Cleanup and code move from <linux/rcupdate.h> to kernel/rcupdate.c: Remove internal details from the header file. Signed-off-by:
Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Andrew Morton authored
From: Manfred Spraul <manfred@colorfullife.com> Step two for reducing cacheline trashing within rcupdate.c: rcu_process_callbacks always acquires rcu_ctrlblk.state.mutex and calls rcu_start_batch, even if the batch is already running or already scheduled to run. This can be avoided with a sequence lock: A sequence lock allows to read the current batch number and next_pending atomically. If next_pending is already set, then there is no need to acquire the global mutex. This means that for each grace period, there will be - one write access to the rcu_ctrlblk.batch cacheline - lots of read accesses to rcu_ctrlblk.batch (3-10*cpus_online()). Behavior similar to the jiffies cacheline, shouldn't be a problem. - cpus_online()+1 write accesses to rcu_ctrlblk.state, all of them starting with spin_lock(&rcu_ctrlblk.state.mutex). For large enough cpus_online() this will be a problem, but all except two of the spin_lock calls only protect the rcu_cpu_mask bitmap, thus a hierarchical bitmap would allow to split the write accesses to multiple cachelines. Tested on an 8-way with reaim. Unfortunately it probably won't help with Jack Steiner's 'ls' test since in this test only one cpu generates rcu entries. Signed-off-by:
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Andrew Morton authored
From: Manfred Spraul <manfred@colorfullife.com> Below is the one of my patches from my rcu lock update. Jack Steiner tested the first one on a 512p and it resolved the rcu cache line trashing. All were tested on osdl with STP. Step one for reducing cacheline trashing within rcupdate.c: The current code uses the rcu_cpu_mask bitmap both for keeping track of the cpus that haven't gone through a quiescent state and for checking if a cpu should look for quiescent states. The bitmap is frequently changed and the check is done by polling - together this causes cache line trashing. If it's cheaper to access a (mostly) read-only cacheline than a cacheline that is frequently dirtied, then it's possible to reduce the trashing by splitting the rcu_cpu_mask bitmap into two cachelines: The patch adds a generation counter and moves it into a separate cacheline. This allows to removes all accesses to rcu_cpumask (in the read-write cacheline) from rcu_pending and at least 50% of the accesses from rcu_check_quiescent_state. rcu_pending and all but one call per cpu to rcu_check_quiescent_state access the read-only cacheline. Probably not enough for 512p, but it's a start, just for 128 byte more memory use, without slowing down rcu grace periods. Obviously the read-only cacheline is not really read-only: it's written once per grace period to indicate that a new grace period is running. Tests on an 8-way Pentium III with reaim showed some improvement: oprofile hits: Reference: http://khack.osdl.org/stp/293075/ Hits % 23741 0.0994 rcu_pending 19057 0.0798 rcu_check_quiescent_state 6530 0.0273 rcu_check_callbacks Patched: http://khack.osdl.org/stp/293076/ 8291 0.0579 rcu_pending 5475 0.0382 rcu_check_quiescent_state 3604 0.0252 rcu_check_callbacks The total runtime differs between both runs, thus the % number must be compared: Around 50% faster. I've uninlined rcu_pending for the test. Tested with reaim and kernbench. Description: - per-cpu quiescbatch and qs_pending fields introduced: quiescbatch contains the number of the last quiescent period that the cpu has seen and qs_pending is set if the cpu has not yet reported the quiescent state for the current period. With these two fields a cpu can test if it should report a quiescent state without having to look at the frequently written rcu_cpu_mask bitmap. - curbatch split into two fields: rcu_ctrlblk.batch.completed and rcu_ctrlblk.batch.cur. This makes it possible to figure out if a grace period is running (completed != cur) without accessing the rcu_cpu_mask bitmap. - rcu_ctrlblk.maxbatch removed and replaced with a true/false next_pending flag: next_pending=1 means that another grace period should be started immediately after the end of the current period. Previously, this was achieved by maxbatch: curbatch==maxbatch means don't start, curbatch!= maxbatch means start. A flag improves the readability: The only possible values for maxbatch were curbatch and curbatch+1. - rcu_ctrlblk split into two cachelines for better performance. - common code from rcu_offline_cpu and rcu_check_quiescent_state merged into cpu_quiet. - rcu_offline_cpu: replace spin_lock_irq with spin_lock_bh, there are no accesses from irq context (and there are accesses to the spinlock with enabled interrupts from tasklet context). - rcu_restart_cpu introduced, s390 should call it after changing nohz: Theoretically the global batch counter could wrap around and end up at RCU_quiescbatch(cpu). Then the cpu would not look for a quiescent state and rcu would lock up. Signed-off-by:
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Andrew Morton authored
From: Rusty Russell <rusty@rustcorp.com.au> Currently every arch declares its own char saved_command_line[]. Make sure every arch defines COMMAND_LINE_SIZE in asm/setup.h, and declare saved_command_line in linux/init.h (init/main.c contains the definition). Signed-off-by:
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Andrew Morton authored
From: Chris Mason <mason@suse.com> jbd needs to wait for any io to complete on the buffer before changing the end_io function. Using set_buffer_locked means that it can change the end_io function while the page is in the middle of writeback, and the writeback bit on the page will never get cleared. Since we set the buffer dirty earlier on, if the page was previously dirty, pdflush or memory pressure might trigger a writepage call, which will race with jbd's set_buffer_locked. Signed-off-by:
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Andrew Morton authored
From: Zwane Mwaikambo <zwane@linuxpower.ca> Following up on Keith's code, I adapted the i386 code to allow enabling interrupts during contested locks depending on previous interrupt enable status. Obviously there will be a text increase (only for non CONFIG_SPINLINE case), although it doesn't seem so bad, there will be an increased exit latency when we attempt a lock acquisition after spinning due to the extra instructions. How much this will affect performance I'm not sure yet as I haven't had time to micro bench. text data bss dec hex filename 2628024 921731 0 3549755 362a3b vmlinux-after 2621369 921731 0 3543100 36103c vmlinux-before 2618313 919222 0 3537535 35fa7f vmlinux-spinline The code has been stress tested on a 16x NUMAQ (courtesy OSDL). Signed-off-by:
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- 23 Jun, 2004 4 commits
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bk://kernel.bkbits.net/davem/net-2.6Linus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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Alexander Viro authored
Via southbridges use register 0x3c of the on-board devices (USB and AC97) to control interrupt routing for those. In drivers/pci/quirks.c we set it correctly (dev->irq & 15). However, in pirq_enable_irq() where the second half of that stuff lives, we forget to apply the mask. That's what causes problems with ioapic on via motherboards in 2.6. One-liner below ACKed by Alan, verified on via-based boxen here, obviously doesn't affect non-via ones (we only set interrupt_line_quirk for via chipsets).
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David S. Miller authored
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Hideaki Yoshifuji authored
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- 22 Jun, 2004 9 commits
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Jesse Barnes authored
This adds sound support for some of the newer PowerBooks. It appears that this chip supports the AWACS sample rates, but has a snapper-style mixer. Tested and works on my PowerBook5,4. Signed-off-by:
Jesse Barnes <jbarnes@sgi.com> Signed-off-by:
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Paul Mackerras authored
This is the PPC64 counterpart of the PPC32 Altivec assist exception handler that went in recently. On PPC64 machines with Altivec (i.e. machines that use the PPC970 chip, such as the G5 powermac), the altivec floating-point instructions can operate in two modes: one where denormalized inputs or outputs are truncated to zero, and one where they aren't. In the latter mode the processor can take an exception when it encounters denormalized floating-point inputs or outputs rather than dealing with them in hardware. This patch adds code to deal properly with the exception, by emulating the instruction that caused the exception. Previously the kernel just switched the altivec unit into the truncate-to-zero mode, which works but is a bit gross. Fortunately there are only a limited set of altivec instructions which can generate the assist exception, so we don't have to emulate the whole altivec instruction set. Note that Altivec is Motorola's name for the PowerPC vector/SIMD instructions; IBM calls the same thing VMX, and currently only IBM makes 64-bit PowerPC CPU chips. Nevertheless, I have used the term Altivec in the PPC64 code for consistency with the PPC32 code. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Benjamin Herrenschmidt authored
The code in radeonfb looking for the BIOS image currently uses the BIOS ROM if any, and falls back to the RAM image if not found. This is unfortunatly not correct for a bunch of laptops where the real panel data are only present in the RAM image. This works around this problem by preferring the RAM image on mobility chipsets. This is definitely not the best workaround, we need some arch support for linking the RAM image to the PCI ID (preferrably by having the arch snapshot it during boot, isolating us completely from the details of where this image is in memory). I'll see how we can get such an improvement later. Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Benjamin Herrenschmidt authored
This adds support for newer Apple laptop models. It adds the basic identification for the new motherboards and the cpufreq support for models using the new 7447A CPU from Motorola. This is mostly the work of John Steele Scott <toojays@toojays.net> with some bits from Sebastian Henschel <linux@kodeaffe.de> and some rework by myself. Please apply, Signed-off-by:
John Steele Scott <toojays@toojays.net> Signed-off-by:
Sebastian Henschel <linux@kodeaffe.de> Signed-off-by:
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Benjamin Herrenschmidt authored
This adds basic oprofile support to ppc32. Originally from Anton Blanchard, I just re-diffed it against current kernels. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Benjamin Herrenschmidt authored
This cleans up arch/ppc/kernel/traps.c and vecemu.c to use the same formatting style for all functions, and fixes 2 warnings in the altivec floating point emulation code. No functional change. Signed-off-by:
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bk://gkernel.bkbits.net/libata-2.6Linus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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Jeff Garzik authored
Certain early SATA drives have problems with write requests whose length satisfy the equation "sectors % 15 == 1", on the SiI 3112. Other drives, and other SiI controllers, are not affected. The fix for this problem is to avoid such requests, in one of three ways, for the affect drive+controller combos: 1) Limit all writes to 15 sectors 2) Use block layer features to avoid creating requests whose length satisfies the above equation. 3) When a request satisfies the above equation, split the request into two writes, neither of which satisfies the equation. I chose fix #1, the most simple to implement. After discussion with Silicon Image and others regarding the impact of this fix, I have decided to remain with fix #1, and will not be implementing a "better fix". This means that the affected SATA drives will see decreased performance, but set of affected drives is small and will never grow larger. Further, the complexity of implementing solution #2 or solution #3 is rather large. When implementing lba48 'large request' support, I unintentionally broke the fix for these affected drives. Kudos to Ricky Beam for noticing this. This change restores the fix, by adding a flag ATA_DFLAG_LOCK_SECTORS to indicate that the max_sectors value set by the low-level driver should never be changed.
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bk://bk.arm.linux.org.uk/linux-2.6-rmkLinus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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- 23 Jun, 2004 5 commits
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David Vrabel authored
Patch from David Vrabel Missing include (cf. include/asm-i386/checksum.h) in include/asm-arm/checksum.h.
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Ian Campbell authored
Patch from Ian Campbell The SA1100 watchdog driver also works fine on the PXA2xx. Tested on a PXA255 based platform.
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John Lenz authored
Patch from John Lenz Switches the collie framebuffer mach_info structure to use the new initializers. Signed-off-by:John Lenz <jelenz@students.wisc.edu>
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John Lenz authored
Patch from John Lenz The __sa1111_probe function is declared __init, and it is called from the sa1111_probe function, which is not declared __init. Signed-off-by: -
bk://dsaxena.bkbits.net/linux-2.6-for-rmkRussell King authored
into flint.arm.linux.org.uk:/usr/src/bk/linux-2.6-rmk
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- 22 Jun, 2004 3 commits
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Russell King authored
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Russell King authored
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bk://bk.arm.linux.org.uk/linux-2.6-serialLinus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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- 23 Jun, 2004 2 commits
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Ian Campbell authored
Patch from Ian Campbell Patch 1848/1 removed the hack for preserving FFUART over sleep. This patch adds back that support in the correct place by converting the PXA serial driver to use the driver model and hooking up the suspend and resume methods.
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Marc Singer authored
Patch from Marc Singer Serial console and port driver for the LH7a40x CPUs. The only change made since the last patch was to change the PORT_ID (again). This patch superceeds two serial driver patches.
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- 22 Jun, 2004 7 commits
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bk://kernel.bkbits.net/davem/net-2.6Linus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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bk://kernel.bkbits.net/davem/sparc-2.6Linus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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David S. Miller authored
into kernel.bkbits.net:/home/davem/sparc-2.6
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David S. Miller authored
into kernel.bkbits.net:/home/davem/nf-2.6
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Arthur Kepner authored
Signed-off-by:
Arthur Kepner <akepner@sgi.com> Signed-off-by:
David S. Miller <davem@redhat.com>
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David S. Miller authored
Put it in per-esp data instead. Noticed by Linus. Signed-off-by: -
bk://kernel.bkbits.net/acme/net-2.6David S. Miller authored
into nuts.davemloft.net:/disk1/BK/net-2.6
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