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...Source distribution Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> Now I am getting log file it has error like this . [root at localhost ~]# cat /var/log/mysqld.log 090120 20:52:20 mysqld ended 090120 20:52:29 mysqld started InnoDB: Unable to lock ./ibdata1, error: 38 090120 20:52:29 InnoDB: Retrying to lock the first data file InnoDB: Unable to lock ./ibdata1, error: 38 InnoDB: Unable to lock ./ibdata1, error: 38 InnoDB: Unable to lock ./ibdata1, error: 38 InnoDB: Unable to lock ./ibdata1, error: 38 InnoDB: Unable to lock ./ibdata1, error:...

On Fri, May 30, 2014 at 11:43:55AM -0400, Waiman Long wrote: > Enabling this configuration feature causes a slight decrease the > performance of an uncontended lock-unlock operation by about 1-2% > mainly due to the use of a static key. However, uncontended lock-unlock > operation are really just a tiny percentage of a real workload. So > there should no noticeable change in application performance. No, entirely unacceptable. > +#ifdef CONFIG_VIR...

On Fri, May 30, 2014 at 11:43:55AM -0400, Waiman Long wrote: > Enabling this configuration feature causes a slight decrease the > performance of an uncontended lock-unlock operation by about 1-2% > mainly due to the use of a static key. However, uncontended lock-unlock > operation are really just a tiny percentage of a real workload. So > there should no noticeable change in application performance. No, entirely unacceptable. > +#ifdef CONFIG_VIR...

On Mon, Dec 05, 2016 at 10:19:21AM -0500, Pan Xinhui wrote: > This patch add basic code to enable qspinlock on powerpc. qspinlock is > one kind of fairlock implementation. And seen some performance improvement > under some scenarios. > > queued_spin_unlock() release the lock by just one write of NULL to the > ::locked field which sits at different places in the two endianness > system....

On Mon, Dec 05, 2016 at 10:19:21AM -0500, Pan Xinhui wrote: > This patch add basic code to enable qspinlock on powerpc. qspinlock is > one kind of fairlock implementation. And seen some performance improvement > under some scenarios. > > queued_spin_unlock() release the lock by just one write of NULL to the > ::locked field which sits at different places in the two endianness > system....

...race: get_cachedir = "/var/tmp" libguestfs: begin building supermin appliance libguestfs: run supermin libguestfs: command: run: /usr/bin/supermin libguestfs: command: run: \ --build libguestfs: command: run: \ --verbose libguestfs: command: run: \ --if-newer libguestfs: command: run: \ --lock /var/tmp/.guestfs-1000/lock libguestfs: command: run: \ --copy-kernel libguestfs: command: run: \ -f ext2 libguestfs: command: run: \ --host-cpu x86_64 libguestfs: command: run: \ /usr/lib/x86_64-linux-gnu/guestfs/supermin.d libguestfs: command: run: \ -o /var/tmp/.guestfs-1000/appliance.d supermin...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Hi all, This is a revised version of the pvticket lock series. The early part of the series is mostly unchanged: it converts the bulk of the ticket lock code into C and makes the "small" and "large" ticket code common. The only changes are the incorporation of various review comments. The latter part of the series converts from p...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Hi all, This is a revised version of the pvticket lock series. The early part of the series is mostly unchanged: it converts the bulk of the ticket lock code into C and makes the "small" and "large" ticket code common. The only changes are the incorporation of various review comments. The latter part of the series converts from p...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Hi all, This is a revised version of the pvticket lock series. The early part of the series is mostly unchanged: it converts the bulk of the ticket lock code into C and makes the "small" and "large" ticket code common. The only changes are the incorporation of various review comments. The latter part of the series converts from p...

To prepare for queued spinlocks. This is a simple rename except to update preprocessor guard name and a file reference. Signed-off-by: Nicholas Piggin <npiggin at gmail.com> --- arch/powerpc/include/asm/simple_spinlock.h | 292 ++++++++++++++++++ .../include/asm/simple_spinlock_types.h | 21 ++ arch/powerpc/inc...

On 12/03/14 18:54, Waiman Long wrote: > Locking is always an issue in a virtualized environment as the virtual > CPU that is waiting on a lock may get scheduled out and hence block > any progress in lock acquisition even when the lock has been freed. > > One solution to this problem is to allow unfair lock in a > para-virtuali...

On 12/03/14 18:54, Waiman Long wrote: > Locking is always an issue in a virtualized environment as the virtual > CPU that is waiting on a lock may get scheduled out and hence block > any progress in lock acquisition even when the lock has been freed. > > One solution to this problem is to allow unfair lock in a > para-virtuali...

...quot; and "large ticket" code common. Only the actual size-dependent asm instructions are specific to the ticket size. The resulting generated asm is very similar to the current hand-written code. This results in a very large reduction in lines of code. 2. Get rid of pv spinlocks, and replace them with pv ticket locks. Currently we have the notion of "pv spinlocks" where a pv-ops backend can completely replace the spinlock implementation with a new one. This has two disadvantages: - its a completely separate spinlock implementation, and - there&...

...quot; and "large ticket" code common. Only the actual size-dependent asm instructions are specific to the ticket size. The resulting generated asm is very similar to the current hand-written code. This results in a very large reduction in lines of code. 2. Get rid of pv spinlocks, and replace them with pv ticket locks. Currently we have the notion of "pv spinlocks" where a pv-ops backend can completely replace the spinlock implementation with a new one. This has two disadvantages: - its a completely separate spinlock implementation, and - there&...

...quot; and "large ticket" code common. Only the actual size-dependent asm instructions are specific to the ticket size. The resulting generated asm is very similar to the current hand-written code. This results in a very large reduction in lines of code. 2. Get rid of pv spinlocks, and replace them with pv ticket locks. Currently we have the notion of "pv spinlocks" where a pv-ops backend can completely replace the spinlock implementation with a new one. This has two disadvantages: - its a completely separate spinlock implementation, and - there&...

Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOW...

Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOW...

v10->v11: - Use a simple test-and-set unfair lock to simplify the code, but performance may suffer a bit for large guest with many CPUs. - Take out Raghavendra KT's test results as the unfair lock changes may render some of his results invalid. - Add PV support without increasing the size of the core queue node structure. - O...

v10->v11: - Use a simple test-and-set unfair lock to simplify the code, but performance may suffer a bit for large guest with many CPUs. - Take out Raghavendra KT's test results as the unfair lock changes may render some of his results invalid. - Add PV support without increasing the size of the core queue node structure. - O...

v9->v10: - Make some minor changes to qspinlock.c to accommodate review feedback. - Change author to PeterZ for 2 of the patches. - Include Raghavendra KT's test results in patch 18. v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843...