diff options
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r-- | kernel/cpuset.c | 380 |
1 files changed, 191 insertions, 189 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 8b35fbd8292..8da627d3380 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -127,6 +127,7 @@ struct cpuset_hotplug_scanner { typedef enum { CS_CPU_EXCLUSIVE, CS_MEM_EXCLUSIVE, + CS_MEM_HARDWALL, CS_MEMORY_MIGRATE, CS_SCHED_LOAD_BALANCE, CS_SPREAD_PAGE, @@ -144,6 +145,11 @@ static inline int is_mem_exclusive(const struct cpuset *cs) return test_bit(CS_MEM_EXCLUSIVE, &cs->flags); } +static inline int is_mem_hardwall(const struct cpuset *cs) +{ + return test_bit(CS_MEM_HARDWALL, &cs->flags); +} + static inline int is_sched_load_balance(const struct cpuset *cs) { return test_bit(CS_SCHED_LOAD_BALANCE, &cs->flags); @@ -735,7 +741,8 @@ static inline int started_after(void *p1, void *p2) * Return nonzero if this tasks's cpus_allowed mask should be changed (in other * words, if its mask is not equal to its cpuset's mask). */ -int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan) +static int cpuset_test_cpumask(struct task_struct *tsk, + struct cgroup_scanner *scan) { return !cpus_equal(tsk->cpus_allowed, (cgroup_cs(scan->cg))->cpus_allowed); @@ -752,7 +759,8 @@ int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan) * We don't need to re-check for the cgroup/cpuset membership, since we're * holding cgroup_lock() at this point. */ -void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan) +static void cpuset_change_cpumask(struct task_struct *tsk, + struct cgroup_scanner *scan) { set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed)); } @@ -941,7 +949,7 @@ static int update_nodemask(struct cpuset *cs, char *buf) cs->mems_generation = cpuset_mems_generation++; mutex_unlock(&callback_mutex); - cpuset_being_rebound = cs; /* causes mpol_copy() rebind */ + cpuset_being_rebound = cs; /* causes mpol_dup() rebind */ fudge = 10; /* spare mmarray[] slots */ fudge += cpus_weight(cs->cpus_allowed); /* imagine one fork-bomb/cpu */ @@ -992,7 +1000,7 @@ static int update_nodemask(struct cpuset *cs, char *buf) * rebind the vma mempolicies of each mm in mmarray[] to their * new cpuset, and release that mm. The mpol_rebind_mm() * call takes mmap_sem, which we couldn't take while holding - * tasklist_lock. Forks can happen again now - the mpol_copy() + * tasklist_lock. Forks can happen again now - the mpol_dup() * cpuset_being_rebound check will catch such forks, and rebind * their vma mempolicies too. Because we still hold the global * cgroup_mutex, we know that no other rebind effort will @@ -1023,19 +1031,6 @@ int current_cpuset_is_being_rebound(void) return task_cs(current) == cpuset_being_rebound; } -/* - * Call with cgroup_mutex held. - */ - -static int update_memory_pressure_enabled(struct cpuset *cs, char *buf) -{ - if (simple_strtoul(buf, NULL, 10) != 0) - cpuset_memory_pressure_enabled = 1; - else - cpuset_memory_pressure_enabled = 0; - return 0; -} - static int update_relax_domain_level(struct cpuset *cs, char *buf) { int val = simple_strtol(buf, NULL, 10); @@ -1053,25 +1048,20 @@ static int update_relax_domain_level(struct cpuset *cs, char *buf) /* * update_flag - read a 0 or a 1 in a file and update associated flag - * bit: the bit to update (CS_CPU_EXCLUSIVE, CS_MEM_EXCLUSIVE, - * CS_SCHED_LOAD_BALANCE, - * CS_NOTIFY_ON_RELEASE, CS_MEMORY_MIGRATE, - * CS_SPREAD_PAGE, CS_SPREAD_SLAB) - * cs: the cpuset to update - * buf: the buffer where we read the 0 or 1 + * bit: the bit to update (see cpuset_flagbits_t) + * cs: the cpuset to update + * turning_on: whether the flag is being set or cleared * * Call with cgroup_mutex held. */ -static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs, char *buf) +static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs, + int turning_on) { - int turning_on; struct cpuset trialcs; int err; int cpus_nonempty, balance_flag_changed; - turning_on = (simple_strtoul(buf, NULL, 10) != 0); - trialcs = *cs; if (turning_on) set_bit(bit, &trialcs.flags); @@ -1241,6 +1231,7 @@ typedef enum { FILE_MEMLIST, FILE_CPU_EXCLUSIVE, FILE_MEM_EXCLUSIVE, + FILE_MEM_HARDWALL, FILE_SCHED_LOAD_BALANCE, FILE_SCHED_RELAX_DOMAIN_LEVEL, FILE_MEMORY_PRESSURE_ENABLED, @@ -1265,7 +1256,8 @@ static ssize_t cpuset_common_file_write(struct cgroup *cont, return -E2BIG; /* +1 for nul-terminator */ - if ((buffer = kmalloc(nbytes + 1, GFP_KERNEL)) == 0) + buffer = kmalloc(nbytes + 1, GFP_KERNEL); + if (!buffer) return -ENOMEM; if (copy_from_user(buffer, userbuf, nbytes)) { @@ -1288,46 +1280,71 @@ static ssize_t cpuset_common_file_write(struct cgroup *cont, case FILE_MEMLIST: retval = update_nodemask(cs, buffer); break; + case FILE_SCHED_RELAX_DOMAIN_LEVEL: + retval = update_relax_domain_level(cs, buffer); + break; + default: + retval = -EINVAL; + goto out2; + } + + if (retval == 0) + retval = nbytes; +out2: + cgroup_unlock(); +out1: + kfree(buffer); + return retval; +} + +static int cpuset_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) +{ + int retval = 0; + struct cpuset *cs = cgroup_cs(cgrp); + cpuset_filetype_t type = cft->private; + + cgroup_lock(); + + if (cgroup_is_removed(cgrp)) { + cgroup_unlock(); + return -ENODEV; + } + + switch (type) { case FILE_CPU_EXCLUSIVE: - retval = update_flag(CS_CPU_EXCLUSIVE, cs, buffer); + retval = update_flag(CS_CPU_EXCLUSIVE, cs, val); break; case FILE_MEM_EXCLUSIVE: - retval = update_flag(CS_MEM_EXCLUSIVE, cs, buffer); + retval = update_flag(CS_MEM_EXCLUSIVE, cs, val); break; - case FILE_SCHED_LOAD_BALANCE: - retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, buffer); + case FILE_MEM_HARDWALL: + retval = update_flag(CS_MEM_HARDWALL, cs, val); break; - case FILE_SCHED_RELAX_DOMAIN_LEVEL: - retval = update_relax_domain_level(cs, buffer); + case FILE_SCHED_LOAD_BALANCE: + retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, val); break; case FILE_MEMORY_MIGRATE: - retval = update_flag(CS_MEMORY_MIGRATE, cs, buffer); + retval = update_flag(CS_MEMORY_MIGRATE, cs, val); break; case FILE_MEMORY_PRESSURE_ENABLED: - retval = update_memory_pressure_enabled(cs, buffer); + cpuset_memory_pressure_enabled = !!val; break; case FILE_MEMORY_PRESSURE: retval = -EACCES; break; case FILE_SPREAD_PAGE: - retval = update_flag(CS_SPREAD_PAGE, cs, buffer); + retval = update_flag(CS_SPREAD_PAGE, cs, val); cs->mems_generation = cpuset_mems_generation++; break; case FILE_SPREAD_SLAB: - retval = update_flag(CS_SPREAD_SLAB, cs, buffer); + retval = update_flag(CS_SPREAD_SLAB, cs, val); cs->mems_generation = cpuset_mems_generation++; break; default: retval = -EINVAL; - goto out2; + break; } - - if (retval == 0) - retval = nbytes; -out2: cgroup_unlock(); -out1: - kfree(buffer); return retval; } @@ -1389,33 +1406,9 @@ static ssize_t cpuset_common_file_read(struct cgroup *cont, case FILE_MEMLIST: s += cpuset_sprintf_memlist(s, cs); break; - case FILE_CPU_EXCLUSIVE: - *s++ = is_cpu_exclusive(cs) ? '1' : '0'; - break; - case FILE_MEM_EXCLUSIVE: - *s++ = is_mem_exclusive(cs) ? '1' : '0'; - break; - case FILE_SCHED_LOAD_BALANCE: - *s++ = is_sched_load_balance(cs) ? '1' : '0'; - break; case FILE_SCHED_RELAX_DOMAIN_LEVEL: s += sprintf(s, "%d", cs->relax_domain_level); break; - case FILE_MEMORY_MIGRATE: - *s++ = is_memory_migrate(cs) ? '1' : '0'; - break; - case FILE_MEMORY_PRESSURE_ENABLED: - *s++ = cpuset_memory_pressure_enabled ? '1' : '0'; - break; - case FILE_MEMORY_PRESSURE: - s += sprintf(s, "%d", fmeter_getrate(&cs->fmeter)); - break; - case FILE_SPREAD_PAGE: - *s++ = is_spread_page(cs) ? '1' : '0'; - break; - case FILE_SPREAD_SLAB: - *s++ = is_spread_slab(cs) ? '1' : '0'; - break; default: retval = -EINVAL; goto out; @@ -1428,121 +1421,137 @@ out: return retval; } - - +static u64 cpuset_read_u64(struct cgroup *cont, struct cftype *cft) +{ + struct cpuset *cs = cgroup_cs(cont); + cpuset_filetype_t type = cft->private; + switch (type) { + case FILE_CPU_EXCLUSIVE: + return is_cpu_exclusive(cs); + case FILE_MEM_EXCLUSIVE: + return is_mem_exclusive(cs); + case FILE_MEM_HARDWALL: + return is_mem_hardwall(cs); + case FILE_SCHED_LOAD_BALANCE: + return is_sched_load_balance(cs); + case FILE_MEMORY_MIGRATE: + return is_memory_migrate(cs); + case FILE_MEMORY_PRESSURE_ENABLED: + return cpuset_memory_pressure_enabled; + case FILE_MEMORY_PRESSURE: + return fmeter_getrate(&cs->fmeter); + case FILE_SPREAD_PAGE: + return is_spread_page(cs); + case FILE_SPREAD_SLAB: + return is_spread_slab(cs); + default: + BUG(); + } +} /* * for the common functions, 'private' gives the type of file */ -static struct cftype cft_cpus = { - .name = "cpus", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_CPULIST, -}; - -static struct cftype cft_mems = { - .name = "mems", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_MEMLIST, -}; - -static struct cftype cft_cpu_exclusive = { - .name = "cpu_exclusive", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_CPU_EXCLUSIVE, -}; - -static struct cftype cft_mem_exclusive = { - .name = "mem_exclusive", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_MEM_EXCLUSIVE, -}; - -static struct cftype cft_sched_load_balance = { - .name = "sched_load_balance", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_SCHED_LOAD_BALANCE, -}; - -static struct cftype cft_sched_relax_domain_level = { - .name = "sched_relax_domain_level", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_SCHED_RELAX_DOMAIN_LEVEL, -}; - -static struct cftype cft_memory_migrate = { - .name = "memory_migrate", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_MEMORY_MIGRATE, +static struct cftype files[] = { + { + .name = "cpus", + .read = cpuset_common_file_read, + .write = cpuset_common_file_write, + .private = FILE_CPULIST, + }, + + { + .name = "mems", + .read = cpuset_common_file_read, + .write = cpuset_common_file_write, + .private = FILE_MEMLIST, + }, + + { + .name = "cpu_exclusive", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_CPU_EXCLUSIVE, + }, + + { + .name = "mem_exclusive", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_MEM_EXCLUSIVE, + }, + + { + .name = "mem_hardwall", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_MEM_HARDWALL, + }, + + { + .name = "sched_load_balance", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_SCHED_LOAD_BALANCE, + }, + + { + .name = "sched_relax_domain_level", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_SCHED_RELAX_DOMAIN_LEVEL, + }, + + { + .name = "memory_migrate", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_MEMORY_MIGRATE, + }, + + { + .name = "memory_pressure", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_MEMORY_PRESSURE, + }, + + { + .name = "memory_spread_page", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_SPREAD_PAGE, + }, + + { + .name = "memory_spread_slab", + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, + .private = FILE_SPREAD_SLAB, + }, }; static struct cftype cft_memory_pressure_enabled = { .name = "memory_pressure_enabled", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, + .read_u64 = cpuset_read_u64, + .write_u64 = cpuset_write_u64, .private = FILE_MEMORY_PRESSURE_ENABLED, }; -static struct cftype cft_memory_pressure = { - .name = "memory_pressure", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_MEMORY_PRESSURE, -}; - -static struct cftype cft_spread_page = { - .name = "memory_spread_page", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_SPREAD_PAGE, -}; - -static struct cftype cft_spread_slab = { - .name = "memory_spread_slab", - .read = cpuset_common_file_read, - .write = cpuset_common_file_write, - .private = FILE_SPREAD_SLAB, -}; - static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont) { int err; - if ((err = cgroup_add_file(cont, ss, &cft_cpus)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_mems)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_cpu_exclusive)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_mem_exclusive)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_memory_migrate)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_sched_load_balance)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, - &cft_sched_relax_domain_level)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_memory_pressure)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_spread_page)) < 0) - return err; - if ((err = cgroup_add_file(cont, ss, &cft_spread_slab)) < 0) + err = cgroup_add_files(cont, ss, files, ARRAY_SIZE(files)); + if (err) return err; /* memory_pressure_enabled is in root cpuset only */ - if (err == 0 && !cont->parent) + if (!cont->parent) err = cgroup_add_file(cont, ss, - &cft_memory_pressure_enabled); - return 0; + &cft_memory_pressure_enabled); + return err; } /* @@ -1642,7 +1651,7 @@ static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont) cpuset_update_task_memory_state(); if (is_sched_load_balance(cs)) - update_flag(CS_SCHED_LOAD_BALANCE, cs, "0"); + update_flag(CS_SCHED_LOAD_BALANCE, cs, 0); number_of_cpusets--; kfree(cs); @@ -1707,7 +1716,8 @@ int __init cpuset_init(void) * Called by cgroup_scan_tasks() for each task in a cgroup. * Return nonzero to stop the walk through the tasks. */ -void cpuset_do_move_task(struct task_struct *tsk, struct cgroup_scanner *scan) +static void cpuset_do_move_task(struct task_struct *tsk, + struct cgroup_scanner *scan) { struct cpuset_hotplug_scanner *chsp; @@ -1958,33 +1968,25 @@ nodemask_t cpuset_mems_allowed(struct task_struct *tsk) } /** - * cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed - * @zl: the zonelist to be checked + * cpuset_nodemask_valid_mems_allowed - check nodemask vs. curremt mems_allowed + * @nodemask: the nodemask to be checked * - * Are any of the nodes on zonelist zl allowed in current->mems_allowed? + * Are any of the nodes in the nodemask allowed in current->mems_allowed? */ -int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl) +int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) { - int i; - - for (i = 0; zl->zones[i]; i++) { - int nid = zone_to_nid(zl->zones[i]); - - if (node_isset(nid, current->mems_allowed)) - return 1; - } - return 0; + return nodes_intersects(*nodemask, current->mems_allowed); } /* - * nearest_exclusive_ancestor() - Returns the nearest mem_exclusive - * ancestor to the specified cpuset. Call holding callback_mutex. - * If no ancestor is mem_exclusive (an unusual configuration), then - * returns the root cpuset. + * nearest_hardwall_ancestor() - Returns the nearest mem_exclusive or + * mem_hardwall ancestor to the specified cpuset. Call holding + * callback_mutex. If no ancestor is mem_exclusive or mem_hardwall + * (an unusual configuration), then returns the root cpuset. */ -static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs) +static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs) { - while (!is_mem_exclusive(cs) && cs->parent) + while (!(is_mem_exclusive(cs) || is_mem_hardwall(cs)) && cs->parent) cs = cs->parent; return cs; } @@ -1998,7 +2000,7 @@ static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs) * __GFP_THISNODE is set, 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. + * hardwalled cpuset ancestor to this tasks cpuset, yes. * If the task has been OOM killed and has access to memory reserves * as specified by the TIF_MEMDIE flag, yes. * Otherwise, no. @@ -2021,7 +2023,7 @@ static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs) * and do not allow allocations outside the current tasks cpuset * unless the task has been OOM killed as is marked TIF_MEMDIE. * GFP_KERNEL allocations are not so marked, so can escape to the - * nearest enclosing mem_exclusive ancestor cpuset. + * nearest enclosing hardwalled ancestor cpuset. * * Scanning up parent cpusets requires callback_mutex. The * __alloc_pages() routine only calls here with __GFP_HARDWALL bit @@ -2044,7 +2046,7 @@ static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs) * in_interrupt - any node ok (current task context irrelevant) * GFP_ATOMIC - any node ok * TIF_MEMDIE - any node ok - * GFP_KERNEL - any node in enclosing mem_exclusive cpuset ok + * GFP_KERNEL - any node in enclosing hardwalled cpuset ok * GFP_USER - only nodes in current tasks mems allowed ok. * * Rule: @@ -2081,7 +2083,7 @@ int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) mutex_lock(&callback_mutex); task_lock(current); - cs = nearest_exclusive_ancestor(task_cs(current)); + cs = nearest_hardwall_ancestor(task_cs(current)); task_unlock(current); allowed = node_isset(node, cs->mems_allowed); |