From 9bf2229f8817677127a60c177aefce1badd22d7b Mon Sep 17 00:00:00 2001 From: Paul Jackson Date: Tue, 6 Sep 2005 15:18:12 -0700 Subject: [PATCH] cpusets: formalize intermediate GFP_KERNEL containment This patch makes use of the previously underutilized cpuset flag 'mem_exclusive' to provide what amounts to another layer of memory placement resolution. With this patch, there are now the following four layers of memory placement available: 1) The whole system (interrupt and GFP_ATOMIC allocations can use this), 2) The nearest enclosing mem_exclusive cpuset (GFP_KERNEL allocations can use), 3) The current tasks cpuset (GFP_USER allocations constrained to here), and 4) Specific node placement, using mbind and set_mempolicy. These nest - each layer is a subset (same or within) of the previous. Layer (2) above is new, with this patch. The call used to check whether a zone (its node, actually) is in a cpuset (in its mems_allowed, actually) is extended to take a gfp_mask argument, and its logic is extended, in the case that __GFP_HARDWALL is not set in the flag bits, to look up the cpuset hierarchy for the nearest enclosing mem_exclusive cpuset, to determine if placement is allowed. The definition of GFP_USER, which used to be identical to GFP_KERNEL, is changed to also set the __GFP_HARDWALL bit, in the previous cpuset_gfp_hardwall_flag patch. GFP_ATOMIC and GFP_KERNEL allocations will stay within the current tasks cpuset, so long as any node therein is not too tight on memory, but will escape to the larger layer, if need be. The intended use is to allow something like a batch manager to handle several jobs, each job in its own cpuset, but using common kernel memory for caches and such. Swapper and oom_kill activity is also constrained to Layer (2). A task in or below one mem_exclusive cpuset should not cause swapping on nodes in another non-overlapping mem_exclusive cpuset, nor provoke oom_killing of a task in another such cpuset. Heavy use of kernel memory for i/o caching and such by one job should not impact the memory available to jobs in other non-overlapping mem_exclusive cpusets. This patch enables providing hardwall, inescapable cpusets for memory allocations of each job, while sharing kernel memory allocations between several jobs, in an enclosing mem_exclusive cpuset. Like Dinakar's patch earlier to enable administering sched domains using the cpu_exclusive flag, this patch also provides a useful meaning to a cpuset flag that had previously done nothing much useful other than restrict what cpuset configurations were allowed. Signed-off-by: Paul Jackson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/cpuset.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 72 insertions(+), 8 deletions(-) (limited to 'kernel') diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 8ab1b4e518b8..214806deca99 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1611,17 +1611,81 @@ int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl) return 0; } +/* + * nearest_exclusive_ancestor() - Returns the nearest mem_exclusive + * ancestor to the specified cpuset. Call while holding cpuset_sem. + * If no ancestor is mem_exclusive (an unusual configuration), then + * returns the root cpuset. + */ +static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs) +{ + while (!is_mem_exclusive(cs) && cs->parent) + cs = cs->parent; + return cs; +} + /** - * cpuset_zone_allowed - is zone z allowed in current->mems_allowed - * @z: zone in question + * cpuset_zone_allowed - Can we allocate memory on zone z's memory node? + * @z: is this zone on an allowed node? + * @gfp_mask: memory allocation flags (we use __GFP_HARDWALL) * - * Is zone z allowed in current->mems_allowed, or is - * the CPU in interrupt context? (zone is always allowed in this case) - */ -int cpuset_zone_allowed(struct zone *z) + * If we're in interrupt, yes, we can always allocate. If zone + * z's node is in our tasks mems_allowed, yes. If it's not a + * __GFP_HARDWALL request and this zone's nodes is in the nearest + * mem_exclusive cpuset ancestor to this tasks cpuset, yes. + * Otherwise, no. + * + * GFP_USER allocations are marked with the __GFP_HARDWALL bit, + * and do not allow allocations outside the current tasks cpuset. + * GFP_KERNEL allocations are not so marked, so can escape to the + * nearest mem_exclusive ancestor cpuset. + * + * Scanning up parent cpusets requires cpuset_sem. The __alloc_pages() + * routine only calls here with __GFP_HARDWALL bit _not_ set if + * it's a GFP_KERNEL allocation, and all nodes in the current tasks + * mems_allowed came up empty on the first pass over the zonelist. + * So only GFP_KERNEL allocations, if all nodes in the cpuset are + * short of memory, might require taking the cpuset_sem semaphore. + * + * The first loop over the zonelist in mm/page_alloc.c:__alloc_pages() + * calls here with __GFP_HARDWALL always set in gfp_mask, enforcing + * hardwall cpusets - no allocation on a node outside the cpuset is + * allowed (unless in interrupt, of course). + * + * The second loop doesn't even call here for GFP_ATOMIC requests + * (if the __alloc_pages() local variable 'wait' is set). That check + * and the checks below have the combined affect in the second loop of + * the __alloc_pages() routine that: + * in_interrupt - any node ok (current task context irrelevant) + * GFP_ATOMIC - any node ok + * GFP_KERNEL - any node in enclosing mem_exclusive cpuset ok + * GFP_USER - only nodes in current tasks mems allowed ok. + **/ + +int cpuset_zone_allowed(struct zone *z, unsigned int __nocast gfp_mask) { - return in_interrupt() || - node_isset(z->zone_pgdat->node_id, current->mems_allowed); + int node; /* node that zone z is on */ + const struct cpuset *cs; /* current cpuset ancestors */ + int allowed = 1; /* is allocation in zone z allowed? */ + + if (in_interrupt()) + return 1; + node = z->zone_pgdat->node_id; + if (node_isset(node, current->mems_allowed)) + return 1; + if (gfp_mask & __GFP_HARDWALL) /* If hardwall request, stop here */ + return 0; + + /* Not hardwall and node outside mems_allowed: scan up cpusets */ + down(&cpuset_sem); + cs = current->cpuset; + if (!cs) + goto done; /* current task exiting */ + cs = nearest_exclusive_ancestor(cs); + allowed = node_isset(node, cs->mems_allowed); +done: + up(&cpuset_sem); + return allowed; } /* -- cgit v1.2.2