- 19 Jan, 2006 25 commits
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Jeff Dike authored
This patch implements soft interrupts. Interrupt enabling and disabling no longer map to sigprocmask. Rather, a flag is set indicating whether interrupts may be handled. If a signal comes in and interrupts are marked as OK, then it is handled normally. If interrupts are marked as off, then the signal handler simply returns after noting that a signal needs handling. When interrupts are enabled later on, this pending signals flag is checked, and the IRQ handlers are called at that point. The point of this is to reduce the cost of local_irq_save et al, since they are very much more common than the signals that they are enabling and disabling. Soft interrupts produce a speed-up of ~25% on a kernel build. Subtleties - UML uses sigsetjmp/siglongjmp to switch contexts. sigsetjmp has been wrapped in a save_flags-like macro which remembers the interrupt state at setjmp time, and restores it when it is longjmp-ed back to. The enable_signals function has to loop because the IRQ handler disables interrupts before returning. enable_signals has to return with signals enabled, and signals may come in between the disabling and the return to enable_signals. So, it loops for as long as there are pending signals, ensuring that signals are enabled when it finally returns, and that there are no pending signals that need to be dealt with. Signed-off-by:Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Jeff Dike authored
Stop using global variables to hold the file descriptor and offset used to map the skas0 stubs. Instead, calculate them using the page physical addresses. Signed-off-by:
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Gennady Sharapov authored
The serial UML OS-abstraction layer patch (um/kernel/skas dir). This moves all systemcalls from skas/process.c file under os-Linux dir and join skas/process.c and skas/process_kern.c files. Signed-off-by:
Gennady Sharapov <gennady.v.sharapov@intel.com> Signed-off-by:
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Gennady Sharapov authored
The serial UML OS-abstraction layer patch (um/kernel/skas dir). This moves all systemcalls from skas/mem_user.c file under os-Linux dir and join skas/mem_user.c and skas/mem.c files. Signed-off-by:
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Gennady Sharapov authored
The serial UML OS-abstraction layer patch (um/kernel dir). This moves skas headers to arch/um/include. Signed-off-by:
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Bodo Stroesser authored
Current implementation of boot_timer_handler isn't usable for s390. So I changed its name to do_boot_timer_handler, taking (struct sigcontext *)sc as argument. do_boot_timer_handler is called from new boot_timer_handler() in arch/um/os-Linux/signal.c, which uses the same mechanisms as other signal handler to find out sigcontext pointer. Signed-off-by:
Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by:
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Gennady Sharapov authored
The serial UML OS-abstraction layer patch (um/kernel dir). This moves all systemcalls from time.c file under os-Linux dir and joins time.c and tine_kernel.c files Signed-off-by:
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Gennady Sharapov authored
The serial UML OS-abstraction layer patch (um/kernel dir). This moves all systemcalls from user_util.c file under os-Linux dir Signed-off-by:
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Bodo Stroesser authored
s390 doesn't have a LDT. So MM_COPY_SEGMENTS will not be supported on s390. The only user of MM_COPY_SEGMENTS is new_mm(), but that's no longer useful, as arch/sys-i386/ldt.c defines init_new_ldt(), which is called immediately after new_mm(). So we should copy host's LDT in init_new_ldt(), if /proc/mm is available, to have this subarch specific call in subarch code. Signed-off-by:
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Jeff Dike authored
Add implementations of the write* and __raw_write* functions. __raw_writel is needed by lib/iocopy.c, which shouldn't be used in UML, but which is unconditionally linked in anyway. Signed-off-by:
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Christoph Lameter authored
Move the interrupt check from slab_node into ___cache_alloc and adds an "unlikely()" to avoid pipeline stalls on some architectures. Signed-off-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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Christoph Lameter authored
This patch fixes a regression in 2.6.14 against 2.6.13 that causes an imbalance in memory allocation during bootup. The slab allocator in 2.6.13 is not numa aware and simply calls alloc_pages(). This means that memory policies may control the behavior of alloc_pages(). During bootup the memory policy is set to MPOL_INTERLEAVE resulting in the spreading out of allocations during bootup over all available nodes. The slab allocator in 2.6.13 has only a single list of slab pages. As a result the per cpu slab cache and the spinlock controlled page lists may contain slab entries from off node memory. The slab allocator in 2.6.13 makes no effort to discern the locality of an entry on its lists. The NUMA aware slab allocator in 2.6.14 controls locality of the slab pages explicitly by calling alloc_pages_node(). The NUMA slab allocator manages slab entries by having lists of available slab pages for each node. The per cpu slab cache can only contain slab entries associated with the node local to the processor. This guarantees that the default allocation mode of the slab allocator always assigns local memory if available. Setting MPOL_INTERLEAVE as a default policy during bootup has no effect anymore. In 2.6.14 all node unspecific slab allocations are performed on the boot processor. This means that most of key data structures are allocated on one node. Most processors will have to refer to these structures making the boot node a potential bottleneck. This may reduce performance and cause unnecessary memory pressure on the boot node. This patch implements NUMA policies in the slab layer. There is the need of explicit application of NUMA memory policies by the slab allcator itself since the NUMA slab allocator does no longer let the page_allocator control locality. The check for policies is made directly at the beginning of __cache_alloc using current->mempolicy. The memory policy is already frequently checked by the page allocator (alloc_page_vma() and alloc_page_current()). So it is highly likely that the cacheline is present. For MPOL_INTERLEAVE kmalloc() will spread out each request to one node after another so that an equal distribution of allocations can be obtained during bootup. It is not possible to push the policy check to lower layers of the NUMA slab allocator since the per cpu caches are now only containing slab entries from the current node. If the policy says that the local node is not to be preferred or forbidden then there is no point in checking the slab cache or local list of slab pages. The allocation better be directed immediately to the lists containing slab entries for the allowed set of nodes. This way of applying policy also fixes another strange behavior in 2.6.13. alloc_pages() is controlled by the memory allocation policy of the current process. It could therefore be that one process is running with MPOL_INTERLEAVE and would f.e. obtain a new page following that policy since no slab entries are in the lists anymore. A page can typically be used for multiple slab entries but lets say that the current process is only using one. The other entries are then added to the slab lists. These are now non local entries in the slab lists despite of the possible availability of local pages that would provide faster access and increase the performance of the application. Another process without MPOL_INTERLEAVE may now run and expect a local slab entry from kmalloc(). However, there are still these free slab entries from the off node page obtained from the other process via MPOL_INTERLEAVE in the cache. The process will then get an off node slab entry although other slab entries may be available that are local to that process. This means that the policy if one process may contaminate the locality of the slab caches for other processes. This patch in effect insures that a per process policy is followed for the allocation of slab entries and that there cannot be a memory policy influence from one process to another. A process with default policy will always get a local slab entry if one is available. And the process using memory policies will get its memory arranged as requested. Off-node slab allocation will require the use of spinlocks and will make the use of per cpu caches not possible. A process using memory policies to redirect allocations offnode will have to cope with additional lock overhead in addition to the latency added by the need to access a remote slab entry. Changes V1->V2 - Remove #ifdef CONFIG_NUMA by moving forward declaration into prior #ifdef CONFIG_NUMA section. - Give the function determining the node number to use a saner name. Signed-off-by:
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Ingo Molnar authored
Convert mm/swapfile.c's swapon_sem to swapon_mutex. Signed-off-by:
Ingo Molnar <mingo@elte.hu> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Christoph Lameter authored
proc support for zone reclaim This patch creates a proc entry /proc/sys/vm/zone_reclaim_mode that may be used to override the automatic determination of the zone reclaim made on bootup. Signed-off-by:
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Christoph Lameter authored
Some bits for zone reclaim exists in 2.6.15 but they are not usable. This patch fixes them up, removes unused code and makes zone reclaim usable. Zone reclaim allows the reclaiming of pages from a zone if the number of free pages falls below the watermarks even if other zones still have enough pages available. Zone reclaim is of particular importance for NUMA machines. It can be more beneficial to reclaim a page than taking the performance penalties that come with allocating a page on a remote zone. Zone reclaim is enabled if the maximum distance to another node is higher than RECLAIM_DISTANCE, which may be defined by an arch. By default RECLAIM_DISTANCE is 20. 20 is the distance to another node in the same component (enclosure or motherboard) on IA64. The meaning of the NUMA distance information seems to vary by arch. If zone reclaim is not successful then no further reclaim attempts will occur for a certain time period (ZONE_RECLAIM_INTERVAL). This patch was discussed before. See http://marc.theaimsgroup.com/?l=linux-kernel&m=113519961504207&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113408418232531&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113389027420032&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113380938612205&w=2Signed-off-by:
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Christoph Lameter authored
Zone reclaim has a huge impact on NUMA performance (f.e. our maximum throughput with XFS is raised from 4GB to 6GB/sec / page cache contamination of numa nodes destroys locality if one just does a large copy operation which results in performance dropping for good until reboot). This patch: Resurrect may_swap in struct scan_control Signed-off-by:
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Christoph Lameter authored
Simplify migrate_page_add after feedback from Hugh. This also allows us to drop one parameter from migrate_page_add. Signed-off-by:
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Nick Piggin authored
Migration code currently does not take a reference to target page properly, so between unlocking the pte and trying to take a new reference to the page with isolate_lru_page, anything could happen to it. Fix this by holding the pte lock until we get a chance to elevate the refcount. Other small cleanups while we're here. Signed-off-by:
Nick Piggin <npiggin@suse.de> Signed-off-by:
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Andrew Morton authored
Ravikiran reports that this variable is bouncing all around nodes on NUMA machines, causing measurable performance problems. Fix that up by only writing to it when it actually changed. And put it in a new cacheline to prevent it sharing with other things (this happened). Signed-off-by:
Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by:
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Jon Mason authored
Some pcnet32 hardware erroneously has the Vendor ID for Trident. The pcnet32 driver looks for the PCI ethernet class before grabbing the hardware, but the current trident driver does not check against the PCI audio class. This allows the trident driver to claim the pcnet32 hardware. This patch prevents that. This revised version of the OSS Trident patch includes PCI_DEVICE Macro usage. Signed-off-by:
Jon Mason <jdmason@us.ibm.com> Signed-off-by:
Muli Ben-Yehuda <mulix@mulix.org> Signed-off-by:
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Paul Fulghum authored
Fix incorrect variable size used to hold register value. This bug might wipe out a portion of the TCR value when setting the interface options. Signed-off-by:
Paul Fulghum <paulkf@microgate.com> Signed-off-by:
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Andrew Morton authored
On alpha: In file included from drivers/scsi/sym53c8xx_2/sym_glue.h:59, from drivers/scsi/sym53c8xx_2/sym_fw.c:40: include/scsi/scsi_transport_spi.h:57: error: field `dv_mutex' has incomplete type Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: -
Jan Beulich authored
Fix a typo/mis-merge in one of the previous patches. Signed-off-by:
Jan Beulich <jbeulich@novell.com> Signed-off-by:
Andi Kleen <ak@suse.de> Signed-off-by:
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Jan Kara authored
We have to check that also the second checkpoint list is non-empty before dropping the transaction. Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Jan Kara authored
While checkpointing we have to check that our transaction still is in the checkpoint list *and* (not or) that it's not just a different transaction with the same address. Signed-off-by:
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- 18 Jan, 2006 15 commits
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Linus Torvalds authored
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Linus Torvalds authored
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Linus Torvalds authored
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Linus Torvalds authored
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David S. Miller authored
Based upon a report and preliminary patch from Jim Gifford. Signed-off-by:David S. Miller <davem@davemloft.net>
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Russell King authored
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Eddie C. Dost authored
From: Eddie C. Dost <ecd@brainaid.de> I have the following patch for serial console over the RSC (remote system controller) on my E250 machine. It basically adds support for input-device=rsc and output-device=rsc from OBP, and allows 115200,8,n,1,- serial mode setting. Signed-off-by: -
John W. Linville authored
Add an entry to MAINTAINERS for wireless networking, just so people know whom to bless with patches. Signed-off-by:
John W. Linville <linville@tuxdriver.com> Signed-off-by:
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John W. Linville authored
Correct location info for net-2.6 git tree. Signed-off-by:
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David Vrabel authored
Patch from David Vrabel Export ixp4xx_exp_bus_size so modules can use the IXP4XX_EXP_BUS_BASE(n) macro. Also, fix a printk format warning. Signed-off-by:
David Vrabel <dvrabel@arcom.com> Signed-off-by:
Russell King <rmk+kernel@arm.linux.org.uk>
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Nicolas Pitre authored
Patch from Nicolas Pitre Commit f4619025 broke the kernel decompressor (at least on PXA). Here's the fix. Signed-off-by:
Nicolas Pitre <nico@cam.org> Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre This is kernel provided user space code. Since a syscall is used, it has to be updated to work with EABI. Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre The signal return path consists of user code provided by the kernel. Since a syscall is used, it has to be updated to work with EABI. Noticed by Daniel Jacobowitz. Signed-off-by:
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Andrew Victor authored
Patch from Andrew Victor This patch fixes two small issues with 2.6.15-git12. 1) Corrected major/minor numbers for ttyAT devices in the KConfig help. (Patch from Karl Olsen) 2) tty->flip.count has been removed. Signed-off-by:
Andrew Victor <andrew@sanpeople.com> Signed-off-by:
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David Vrabel authored
Patch from David Vrabel PXA27x SSP controller has a few different registers, including SCR (serial clock rate) in SSCR0. Signed-off-by:
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