- 16 Jul, 2007 10 commits
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Avi Kivity authored
A typical demand page/copy on write pattern is: - page fault on vaddr - kvm propagates fault to guest - guest handles fault, updates pte - kvm traps write, clears shadow pte, resumes guest - guest returns to userspace, re-faults on same vaddr - kvm installs shadow pte, resumes guest - guest continues So, three vmexits for a single guest page fault. But if instead of clearing the page table entry, we update to correspond to the value that the guest has just written, we eliminate the third vmexit. This patch does exactly that, reducing kbuild time by about 10%. Signed-off-by:Avi Kivity <avi@qumranet.com>
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Avi Kivity authored
When a guest writes to a page that has an mmu shadow, we have to clear the shadow pte corresponding to the memory location touched by the guest. Now, in nonpae mode, a single guest page may have two or four shadow pages (because a nonpae page maps 4MB or 4GB, whereas the pae shadow maps 2MB or 1GB), so we when we look up the page we find up to three additional aliases for the page. Since we _clear_ the shadow pte, it doesn't matter except for a slight performance penalty, but if we want to _update_ the shadow pte instead of clearing it, it is vital that we don't modify the aliases. Fortunately, exactly which page is needed (the "quadrant") is easily computed, and is accessible in the shadow page header. All we need is to ignore shadow pages from the wrong quadrants. Signed-off-by: -
Avi Kivity authored
Instead of calling two functions and repeating expensive checks, call one function and provide it with before/after information. Signed-off-by: -
Avi Kivity authored
i386 wants fs for accessing the pda even on a lightweight exit, so ensure we can always restore it. This fixes a regression on i386 introduced by the lightweight vmexit patch. Signed-off-by: -
Avi Kivity authored
The kvm mmu tries to detects forks by looking for repeated writes to a page table. If it sees a fork, it unshadows the page table so the page table copying can proceed at native speed instead of being emulated. However, the detector also triggered on simple demand paging access patterns: a linear walk of memory would of course cause repeated writes to the same pagetable page, causing it to unshadow prematurely. Fix by resetting the fork detector if we detect a demand fault. Signed-off-by: -
Avi Kivity authored
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Avi Kivity authored
Many msrs and the like will only be used by the host if we schedule() or return to userspace. Therefore, we avoid saving them if we handle the exit within the kernel, and if a reschedule is not requested. Based on a patch from Eddie Dong <eddie.dong@intel.com> with a couple of fixes by me. Signed-off-by:
Yaozu(Eddie) Dong <eddie.dong@intel.com> Signed-off-by:
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Avi Kivity authored
This allows us to remove write protection earlier than otherwise. Should some mad OS choose to use byte writes to update pagetables, it will suffer a performance hit, but still work correctly. Signed-off-by: -
Anthony Liguori authored
The PC debug port is used for IO delay and does not require emulation. Signed-off-by:
Anthony Liguori <aliguori@us.ibm.com> Signed-off-by:
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He, Qing authored
This patch enables IO bitmaps control on vmx and unmask the 0x80 port to avoid VMEXITs caused by accessing port 0x80. 0x80 is used as delays (see include/asm/io.h), and handling VMEXITs on its access is unnecessary but slows things down. This patch improves kernel build test at around 3%~5%. Because every VM uses the same io bitmap, it is shared between all VMs rather than a per-VM data structure. Signed-off-by:
Qing He <qing.he@intel.com> Signed-off-by:
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- 15 Jul, 2007 30 commits
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git://git.infradead.org/battery-2.6Linus Torvalds authored
* git://git.infradead.org/battery-2.6: git-battery vs git-acpi Power supply class and drivers: remove non obligatory return statements pda_power: clean up irq, timer MAINTAINERS: Add maintainers for power supply subsystem and drivers Fixed up trivial conflict in drivers/w1/slaves/w1_ds2760.c manually
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Linus Torvalds authored
* master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (166 commits) [SCSI] ibmvscsi: convert to use the data buffer accessors [SCSI] dc395x: convert to use the data buffer accessors [SCSI] ncr53c8xx: convert to use the data buffer accessors [SCSI] sym53c8xx: convert to use the data buffer accessors [SCSI] ppa: coding police and printk levels [SCSI] aic7xxx_old: remove redundant GFP_ATOMIC from kmalloc [SCSI] i2o: remove redundant GFP_ATOMIC from kmalloc from device.c [SCSI] remove the dead CYBERSTORMIII_SCSI option [SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA [SCSI] Clean up scsi_add_lun a bit [SCSI] 53c700: Remove printk, which triggers because of low scsi clock on SNI RMs [SCSI] sni_53c710: Cleanup [SCSI] qla4xxx: Fix underrun/overrun conditions [SCSI] megaraid_mbox: use mutex instead of semaphore [SCSI] aacraid: add 51245, 51645 and 52245 adapters to documentation. [SCSI] qla2xxx: update version to 8.02.00-k1. [SCSI] qla2xxx: add support for NPIV [SCSI] stex: use resid for xfer len information [SCSI] Add Brownie 1200U3P to blacklist [SCSI] scsi.c: convert to use the data buffer accessors ... -
Linus Torvalds authored
* 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: (53 commits) [TCP]: Verify the presence of RETRANS bit when leaving FRTO [IPV6]: Call inet6addr_chain notifiers on link down [NET_SCHED]: Kill CONFIG_NET_CLS_POLICE [NET_SCHED]: act_api: qdisc internal reclassify support [NET_SCHED]: sch_dsmark: act_api support [NET_SCHED]: sch_atm: act_api support [NET_SCHED]: sch_atm: Lindent [IPV6]: MSG_ERRQUEUE messages do not pass to connected raw sockets [IPV4]: Cleanup call to __neigh_lookup() [NET_SCHED]: Revert "avoid transmit softirq on watchdog wakeup" optimization [NETFILTER]: nf_conntrack: UDPLITE support [NETFILTER]: nf_conntrack: mark protocols __read_mostly [NETFILTER]: x_tables: add connlimit match [NETFILTER]: Lower *tables printk severity [NETFILTER]: nf_conntrack: Don't track locally generated special ICMP error [NETFILTER]: nf_conntrack: Introduces nf_ct_get_tuplepr and uses it [NETFILTER]: nf_conntrack: make l3proto->prepare() generic and renames it [NETFILTER]: nf_conntrack: Increment error count on parsing IPv4 header [NET]: Add ethtool support for NETIF_F_IPV6_CSUM devices. [AF_IUCV]: Add lock when updating accept_q ...
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git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fsLinus Torvalds authored
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs: 9p: fix a race condition bug in umount which caused a segfault 9p: re-enable mount time debug option 9p: cache meta-data when cache=loose net/9p: set error to EREMOTEIO if trans->write returns zero net/9p: change net/9p module name to 9pnet 9p: Reorganization of 9p file system code
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git://oss.sgi.com:8090/xfs/xfs-2.6Linus Torvalds authored
* 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6: (37 commits) [XFS] Fix lockdep annotations for xfs_lock_inodes [LIB]: export radix_tree_preload() [XFS] Fix XFS_IOC_FSBULKSTAT{,_SINGLE} & XFS_IOC_FSINUMBERS in compat mode [XFS] Compat ioctl handler for handle operations [XFS] Compat ioctl handler for XFS_IOC_FSGEOMETRY_V1. [XFS] Clean up function name handling in tracing code [XFS] Quota inode has no parent. [XFS] Concurrent Multi-File Data Streams [XFS] Use uninitialized_var macro to stop warning about rtx [XFS] XFS should not be looking at filp reference counts [XFS] Use is_power_of_2 instead of open coding checks [XFS] Reduce shouting by removing unnecessary macros from dir2 code. [XFS] Simplify XFS min/max macros. [XFS] Kill off xfs_count_bits [XFS] Cancel transactions on xfs_itruncate_start error. [XFS] Use do_div() on 64 bit types. [XFS] Fix remount,readonly path to flush everything correctly. [XFS] Cleanup inode extent size hint extraction [XFS] Prevent ENOSPC from aborting transactions that need to succeed [XFS] Prevent deadlock when flushing inodes on unmount ...
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Al Viro authored
It depends on tristate I2C and it's trivial to make modular. The current Kconfig allows I2C=m, I2C_ACORN=y, which doesn't work at all; alternatives are dependency on I2C=y and making I2C_ACORN itself a tristate. The latter is the right thing to do... Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Acked-by:
Russell King <rmk+kernel@arm.linux.org.uk>
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Al Viro authored
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Al Viro authored
Fallout from commit 91a69029 ('sysfs: add parameter "struct bin_attribute *" ...') Signed-off-by:
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Al Viro authored
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Al Viro authored
Signed-off-by:
Jeff Garzik <jeff@garzik.org> Signed-off-by:
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Al Viro authored
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Al Viro authored
s390 is the only 32bit with unsigned long for size_t (usual for those is unsigned int). Tell sparse... Signed-off-by:
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Al Viro authored
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Al Viro authored
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Al Viro authored
It returns __sum16, not unsigned int Signed-off-by:
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Al Viro authored
... so all proud owners of s390-based PDAs will have to live without that one Signed-off-by:
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Al Viro authored
Going through the string and waiting for _pointer_ to become '\0' is not what the authors meant... Signed-off-by:
Ben Collins <ben.collins@ubuntu.com> Signed-off-by:
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Al Viro authored
Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Al Viro authored
Shows how many people are testing coda - the bug had been there for 5 years and results of stepping on it are not subtle. Signed-off-by:
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Al Viro authored
still looks racy (and definitely leaks) Signed-off-by:
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Andrew Morton authored
drivers/w1/slaves/w1_ds2760.c:85: warning: initialization from incompatible pointer type The ACPI guys changed the bin_attr APIs (commit 91a69029) Cc: Anton Vorontsov <cbou@mail.ru> Cc: Len Brown <lenb@kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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Anton Vorontsov authored
Per Jeff Garzik request. Signed-off-by:
Anton Vorontsov <cbou@mail.ru>
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Jeff Garzik authored
Clean up pda_power interrupt handling: Prior to this patch, the driver would pass information it needed to the interrupt handler dev_id pointer, and then prompt forget it ever did so, recreating that same information after a couple passes through the timer-based state machine. This patch removes the redundant checks by passing the pda_power_supply[] pointer through the state machine. The current code passed 'irq' through the state machine, as an index to recreate the pointer, when we could more simply pass around the pointer itself. This patch makes it easier to remove the 'irq' argument in the future, in addition to cleaning up the driver today. Signed-off-by: -
Anton Vorontsov authored
Signed-off-by:
David Woodhouse <dwmw2@infradead.org>
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FUJITA Tomonori authored
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. Signed-off-by:
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Santiago Leon <santil@us.ibm.com> Signed-off-by:
James Bottomley <James.Bottomley@SteelEye.com>
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FUJITA Tomonori authored
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup. Signed-off-by:
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FUJITA Tomonori authored
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup. Signed-off-by:
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FUJITA Tomonori authored
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup. Signed-off-by:
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Alan Cox authored
Add printk levels Clean up some oddities of formatting Fix goto labels Signed-off-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Satyam Sharma authored
drivers/scsi/aic7xxx_old.c:aic7xxx_slave_alloc() unnecessarily passes GFP_ATOMIC (along with GFP_KERNEL) to kmalloc() from a context that is not atomic. Remove the pointless GFP_ATOMIC. Signed-off-by:
Satyam Sharma <ssatyam@cse.iitk.ac.in> Signed-off-by:
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