The patch titled Cpuset hardwall flag: add a mem_hardwall flag to cpusets has been removed from the -mm tree. Its filename was cpuset-hardwall-flag-add-a-mem_hardwall-flag-to-cpusets.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: Cpuset hardwall flag: add a mem_hardwall flag to cpusets From: Paul Menage <menage@xxxxxxxxxx> This flag provides the hardwalling properties of mem_exclusive, without enforcing the exclusivity. Either mem_hardwall or mem_exclusive is sufficient to prevent GFP_KERNEL allocations from passing outside the cpuset's assigned nodes. Signed-off-by: Paul Menage <menage@xxxxxxxxxx> Acked-by: Paul Jackson <pj@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/cpusets.txt | 26 ++++++++++--------- kernel/cpuset.c | 48 ++++++++++++++++++++++++------------ 2 files changed, 46 insertions(+), 28 deletions(-) diff -puN Documentation/cpusets.txt~cpuset-hardwall-flag-add-a-mem_hardwall-flag-to-cpusets Documentation/cpusets.txt --- a/Documentation/cpusets.txt~cpuset-hardwall-flag-add-a-mem_hardwall-flag-to-cpusets +++ a/Documentation/cpusets.txt @@ -171,6 +171,7 @@ files describing that cpuset: - memory_migrate flag: if set, move pages to cpusets nodes - cpu_exclusive flag: is cpu placement exclusive? - mem_exclusive flag: is memory placement exclusive? + - mem_hardwall flag: is memory allocation hardwalled - memory_pressure: measure of how much paging pressure in cpuset In addition, the root cpuset only has the following file: @@ -222,17 +223,18 @@ If a cpuset is cpu or mem exclusive, no a direct ancestor or descendent, may share any of the same CPUs or Memory Nodes. -A cpuset that is mem_exclusive restricts kernel allocations for -page, buffer and other data commonly shared by the kernel across -multiple users. All cpusets, whether mem_exclusive or not, restrict -allocations of memory for user space. This enables configuring a -system so that several independent jobs can share common kernel data, -such as file system pages, while isolating each jobs user allocation in -its own cpuset. To do this, construct a large mem_exclusive cpuset to -hold all the jobs, and construct child, non-mem_exclusive cpusets for -each individual job. Only a small amount of typical kernel memory, -such as requests from interrupt handlers, is allowed to be taken -outside even a mem_exclusive cpuset. +A cpuset that is mem_exclusive *or* mem_hardwall is "hardwalled", +i.e. it restricts kernel allocations for page, buffer and other data +commonly shared by the kernel across multiple users. All cpusets, +whether hardwalled or not, restrict allocations of memory for user +space. This enables configuring a system so that several independent +jobs can share common kernel data, such as file system pages, while +isolating each job's user allocation in its own cpuset. To do this, +construct a large mem_exclusive cpuset to hold all the jobs, and +construct child, non-mem_exclusive cpusets for each individual job. +Only a small amount of typical kernel memory, such as requests from +interrupt handlers, is allowed to be taken outside even a +mem_exclusive cpuset. 1.5 What is memory_pressure ? @@ -707,7 +709,7 @@ Now you want to do something with this c In this directory you can find several files: # ls -cpus cpu_exclusive mems mem_exclusive tasks +cpus cpu_exclusive mems mem_exclusive mem_hardwall tasks Reading them will give you information about the state of this cpuset: the CPUs and Memory Nodes it can use, the processes that are using diff -puN kernel/cpuset.c~cpuset-hardwall-flag-add-a-mem_hardwall-flag-to-cpusets kernel/cpuset.c --- a/kernel/cpuset.c~cpuset-hardwall-flag-add-a-mem_hardwall-flag-to-cpusets +++ a/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 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); @@ -1042,12 +1048,9 @@ static int update_relax_domain_level(str /* * 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. */ @@ -1228,6 +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, @@ -1312,6 +1316,9 @@ static int cpuset_write_u64(struct cgrou case FILE_MEM_EXCLUSIVE: retval = update_flag(CS_MEM_EXCLUSIVE, cs, val); break; + case FILE_MEM_HARDWALL: + retval = update_flag(CS_MEM_HARDWALL, cs, val); + break; case FILE_SCHED_LOAD_BALANCE: retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, val); break; @@ -1422,6 +1429,8 @@ static u64 cpuset_read_u64(struct cgroup 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: @@ -1474,6 +1483,13 @@ static struct cftype files[] = { }, { + .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, @@ -1962,14 +1978,14 @@ int cpuset_nodemask_valid_mems_allowed(n } /* - * 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; } @@ -1983,7 +1999,7 @@ static const struct cpuset *nearest_excl * __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. @@ -2006,7 +2022,7 @@ static const struct cpuset *nearest_excl * 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 @@ -2029,7 +2045,7 @@ static const struct cpuset *nearest_excl * 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: @@ -2066,7 +2082,7 @@ int __cpuset_zone_allowed_softwall(struc 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); _ Patches currently in -mm which might be from menage@xxxxxxxxxx are origin.patch disable-the-memory-controller-by-default-v3.patch add-a-refcount-check-in-dput.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html