- 24 Aug, 2004 14 commits
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Matthew Dobson authored
In light of some proposed changes in the sched_domains code, I coded up this little ditty that simply creates and populates a cpu_sibling_map for PPC64 machines. The patch just checks the CPU flags to determine if the CPU supports SMT (aka Hyper-Threading aka Multi-Threading aka ...) and fills in a mask of the siblings for each CPU in the system. This should allow us to build sched_domains for PPC64 with generic code in kernel/sched.c for the SMT systems. SMT is becoming more popular and is turning up in more and more architectures. I don't think it will be too long until this feature is supported by most arches... Signed-off-by:
Matthew Dobson <colpatch@us.ibm.com> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Dimitri Sivanich authored
Here's a version of the isolated scheduler domain code that I mentioned in an RFC on 7/22. This patch applies on top of 2.6.8-rc2-mm1 (to include all of the new arch_init_sched_domain code). This patch also contains the 2 line fix to remove the check of first_cpu(sd->groups->cpumask)) that Jesse sent in earlier. Note that this has not been tested with CONFIG_SCHED_SMT. I hope that my handling of those instances is OK. Signed-off-by:
Dimitri Sivanich <sivanich@sgi.com> Signed-off-by:
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Jesse Barnes authored
This patch limits the cpu span of each node's scheduler domain to prevent balancing across too many cpus. The cpus included in a node's domain are determined by the SD_NODES_PER_DOMAIN define and the arch specific sched_domain_node_span routine if ARCH_HAS_SCHED_DOMAIN is defined. If ARCH_HAS_SCHED_DOMAIN is not defined, behavior is unchanged--all possible cpus will be included in each node's scheduling domain. Currently, only ia64 provides an arch specific sched_domain_node_span routine. From: Jesse Barnes <jbarnes@engr.sgi.com> This patch adds some more NUMA specific logic to the creation of scheduler domains. Domains spanning all CPUs in a large system are too large to schedule across efficiently, leading to livelocks and inordinate amounts of time being spent in scheduler routines. With this patch applied, the node scheduling domains for NUMA platforms will only contain a specified number of nearby CPUs, based on the value of SD_NODES_PER_DOMAIN. It also allows arches to override SD_NODE_INIT, which sets the domain scheduling parameters for each node's domain. This is necessary especially for large systems. Possible future directions: o multilevel node hierarchy (e.g. node domains could contain 4 nodes worth of CPUs, supernode domains could contain 32 nodes worth, etc. each with their own SD_NODE_INIT values) o more tweaking of SD_NODE_INIT values for good load balancing vs. overhead tradeoffs From: mita akinobu <amgta@yacht.ocn.ne.jp> Compile fix Signed-off-by:Jesse Barnes <jbarnes@sgi.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Nick Piggin authored
Teach the generic domains builder about SMT, and consolidate all architecture specific domain code into that. Also, the SD_*_INIT macros can now be redefined by arch code without duplicating the entire setup code. This can be done by defining ARCH_HASH_SCHED_TUNE. The generic builder has been simplified with the addition of a helper macro which will probably prove to be useful to arch specific code as well and should be exported if that is the case. Signed-off-by:
Nick Piggin <nickpiggin@yahoo.com.au> From: Matthew Dobson <colpatch@us.ibm.com> The attached patch is against 2.6.8-rc2-mm2, and removes Nick's conditional definition & population of cpu_sibling_map[] in favor of my unconditional ones. This does not affect how cpu_sibling_map is used, just gives it broader scope. From: Nick Piggin <nickpiggin@yahoo.com.au> Small fix to sched-consolidate-domains.patch picked up by From: Suresh <suresh.b.siddha@intel.com> another sched consolidate domains fix From: Nick Piggin <nickpiggin@yahoo.com.au> Don't use cpu_sibling_map if !CONFIG_SCHED_SMT This one spotted by Dimitri Sivanich <sivanich@sgi.com> Signed-off-by:
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Ingo Molnar authored
- remove the hotplug lock from around much of fork(), and re-copy the cpus_allowed mask to solve the hotplug race cleanly. Signed-off-by:
Srivatsa Vaddagiri <vatsa@in.ibm.com> Signed-off-by:
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Nick Piggin authored
This removes balance on clone capability altogether. I told Andi we wouldn't remove it yet, but provided it is in a single small patch, he mightn't get too upset. Signed-off-by:
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Nick Piggin authored
Don't balance on clone by default. Balance on clone has a number of trivial performance failure cases, but it was needed to get decent OpenMP performance on NUMA (Opteron) systems. Not doing child-runs-first for new threads also solves this problem in a nicer way (implemented in a previous patch). Signed-off-by:
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Nick Piggin authored
Add some likely/unliklies, a for_each_cpu => for_each_cpu_online, and close the sched_exit race. From: Ingo Molnar <mingo@elte.hu> fix a typo in a previous patch breaking RT scheduling & interactivity. Signed-off-by:
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Nick Piggin authored
From: Ingo Molnar <mingo@elte.hu> RT tasks are unlikely, move this into rt_task() instead of open-coding it. Signed-off-by:
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Ingo Molnar authored
- fix two stale comments - cleanup Signed-off-by:
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Nick Piggin authored
Now that init_idle does not remove tasks from the runqueue, those architectures that use kernel_thread instead of copy_process for the idle task will break. To fix, ensure that CLONE_IDLETASK tasks are not put on the runqueue in the first place. Signed-off-by:
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Nick Piggin authored
Move balancing and child-runs-first logic from fork.c into sched.c where it belongs. * Consolidate wake_up_forked_process and wake_up_forked_thread into wake_up_new_process, and pass in clone_flags as suggested by Linus. This removes a lot of code duplication and allows all logic to be handled in that function. * Don't do balance-on-clone balancing for vfork'ed threads. * Don't do set_task_cpu or balance one clone in wake_up_new_process. Instead do it in sched_fork to fix set_cpus_allowed races. * Don't do child-runs-first for CLONE_VM processes, as there is obviously no COW benifit to be had. This is a big one, it enables Andi's workload to run well without clone balancing, because the OpenMP child threads can get balanced off to other nodes *before* they start running and allocating memory. * Rename sched_balance_exec to sched_exec: hide the policy from the API. From: Ingo Molnar <mingo@elte.hu> rename wake_up_new_process -> wake_up_new_task. in sched.c we are gradually moving away from the overloaded 'process' or 'thread' notion to the traditional task (or context) naming. Signed-off-by:
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Nick Piggin authored
Clean up init_idle to not use wake_up_forked_process, then undo all the stuff that call does. Instead, do everything in init_idle. Make double_rq_lock depend on CONFIG_SMP because it is no longer used on UP. Signed-off-by:
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Ingo Molnar authored
The main benefit is that with the default HZ=1000 nice +19 tasks now get 5 msecs of timeslices, so the ratio of CPU use is linear. (nice 0 task gets 20 times more CPU time than a nice 19 task. Prior this change the ratio was 1:10) another effect is that nice 0 tasks now get a round 100 msecs of timeslices (as intended), instead of 102 msecs. here's a table of old/new timeslice values, for HZ=1000 and 100: HZ=1000 ( HZ=100 ) old new ( old new ) nice -20: 200 200 ( 200 200 ) nice -19: 195 195 ( 190 190 ) ... nice 0: 102 100 ( 100 100 ) nice 1: 97 95 ( 90 90 ) nice 2: 92 90 ( 90 90 ) ... nice 17: 19 15 ( 10 10 ) nice 18: 14 10 ( 10 10 ) nice 19: 10 5 ( 10 10 ) i've tested the patch on x86. Signed-off-by:
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- 23 Aug, 2004 26 commits
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Linus Torvalds authored
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Paul Mackerras authored
This patch changes hose_list from a simple linked list to a "list.h"-style list. This is in preparation for the runtime addition/removal of PCI Host Bridges. Signed-off-by:
John Rose <johnrose@austin.ibm.com> Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Nathan Fontenot authored
On some platforms (notably power5) you can't enable surveillance (firmware/service processor watchdog) from the kernel - you have to do it in the firmware. This patch changes enable_surveillance() to make the message that is printed in this situation more informative. Additionaly, the rtas_call was changed to rtas_set_indicator so as to avoid having to handle RTAS_BUSY returns. Signed-off-by:
Nathan Fontenot <nfont@austin.ibm.com> Signed-off-by:
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bk://ppc.bkbits.net/for-linus-ppc64Linus Torvalds authored
into ppc970.osdl.org:/home/torvalds/v2.6/linux
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Linus Torvalds authored
The code doesn't actually _care_ about 32/64-bit issues, only about F_SETLK vs F_SETLKW, and the F_SETLK64 doesn't exist except as a compatibility thing on 64-bit architectures (since the regular one already _is_ 64-bit, of course).
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http://nfsclient.bkbits.net/linux-2.6Trond Myklebust authored
into fys.uio.no:/home/linux/bitkeeper/nfsclient-2.6
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Trond Myklebust authored
server are not allowed to be interrupted as that may result in the client and server disagreeing.
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Trond Myklebust authored
recall ability. Signed-off-by:Trond Myklebust <trond.myklebust@fys.uio.no>
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Trond Myklebust authored
NFS4ERR_CB_PATH_DOWN error.
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Trond Myklebust authored
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Trond Myklebust authored
into fys.uio.no:/home/linux/bitkeeper/work/nfsclient-2.6
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http://nfsclient.bkbits.net/linux-2.6Trond Myklebust authored
into fys.uio.no:/home/linux/bitkeeper/nfsclient-2.6
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Trond Myklebust authored
rather than an inode argument. Fix up nfs_instantiate() and _nfs4_do_open to use this since doing a new lookup might be racy.
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Trond Myklebust authored
NFS4ERR_DELAY on the GETATTR call.
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Trond Myklebust authored
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Trond Myklebust authored
that hangs off filp->private_data. As a side effect, this also cleans up the NFSv4 private file state info. Signed-off-by: -
Trond Myklebust authored
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Trond Myklebust authored
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