| Message ID | 1589611660-89854-4-git-send-email-feng.tang@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | make vm_committed_as_batch aware of vm overcommit policy | expand |
On Sat, 16 May 2020 14:47:40 +0800 Feng Tang <feng.tang@intel.com> wrote: > When checking a performance change for will-it-scale scalability > mmap test [1], we found very high lock contention for spinlock of > percpu counter 'vm_committed_as': > > 94.14% 0.35% [kernel.kallsyms] [k] _raw_spin_lock_irqsave > 48.21% _raw_spin_lock_irqsave;percpu_counter_add_batch;__vm_enough_memory;mmap_region;do_mmap; > 45.91% _raw_spin_lock_irqsave;percpu_counter_add_batch;__do_munmap; > > Actually this heavy lock contention is not always necessary. The > 'vm_committed_as' needs to be very precise when the strict > OVERCOMMIT_NEVER policy is set, which requires a rather small batch > number for the percpu counter. > > So keep 'batch' number unchanged for strict OVERCOMMIT_NEVER policy, > and lift it to 64X for OVERCOMMIT_ALWAYS and OVERCOMMIT_GUESS policies. > Also add a sysctl handler to adjust it when the policy is reconfigured. > > Benchmark with the same testcase in [1] shows 53% improvement on a > 8C/16T desktop, and 2097%(20X) on a 4S/72C/144T server. We tested > with test platforms in 0day (server, desktop and laptop), and 80%+ > platforms shows improvements with that test. And whether it shows > improvements depends on if the test mmap size is bigger than the > batch number computed. > > And if the lift is 16X, 1/3 of the platforms will show improvements, > though it should help the mmap/unmap usage generally, as Michal Hocko > mentioned: > " > I believe that there are non-synthetic worklaods which would benefit > from a larger batch. E.g. large in memory databases which do large > mmaps during startups from multiple threads. > " > This needed some adjustments to overcommit_policy_handler() after linux-next's 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler"). Relevant parts are below. --- a/include/linux/mm.h~mm-adjust-vm_committed_as_batch-according-to-vm-overcommit-policy +++ a/include/linux/mm.h @@ -205,6 +205,8 @@ int overcommit_ratio_handler(struct ctl_ loff_t *); int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *, loff_t *); +int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, + loff_t *); #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) --- a/mm/util.c~mm-adjust-vm_committed_as_batch-according-to-vm-overcommit-policy +++ a/mm/util.c @@ -746,6 +746,18 @@ int overcommit_ratio_handler(struct ctl_ return ret; } +int overcommit_policy_handler(struct ctl_table *table, int write, void *buffer, + size_t *lenp, loff_t *ppos) +{ + int ret; + + ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); + if (ret == 0 && write) + mm_compute_batch(); + + return ret; +} + int overcommit_kbytes_handler(struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos) {
diff --git a/include/linux/mm.h b/include/linux/mm.h index 5a32342..bc3722f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -205,6 +205,8 @@ extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); +extern int overcommit_policy_handler(struct ctl_table *, int, void __user *, + size_t *, loff_t *); #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) diff --git a/include/linux/mman.h b/include/linux/mman.h index 4b08e9c..91c93c1 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -57,8 +57,12 @@ extern struct percpu_counter vm_committed_as; #ifdef CONFIG_SMP extern s32 vm_committed_as_batch; +extern void mm_compute_batch(void); #else #define vm_committed_as_batch 0 +static inline void mm_compute_batch(void) +{ +} #endif unsigned long vm_memory_committed(void); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 8a176d8..6fa552d 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1278,7 +1278,7 @@ static struct ctl_table vm_table[] = { .data = &sysctl_overcommit_memory, .maxlen = sizeof(sysctl_overcommit_memory), .mode = 0644, - .proc_handler = proc_dointvec_minmax, + .proc_handler = overcommit_policy_handler, .extra1 = SYSCTL_ZERO, .extra2 = &two, }, diff --git a/mm/mm_init.c b/mm/mm_init.c index 7da6991..b48dafd 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -13,6 +13,7 @@ #include <linux/memory.h> #include <linux/notifier.h> #include <linux/sched.h> +#include <linux/mman.h> #include "internal.h" #ifdef CONFIG_DEBUG_MEMORY_INIT @@ -140,14 +141,23 @@ EXPORT_SYMBOL_GPL(mm_kobj); #ifdef CONFIG_SMP s32 vm_committed_as_batch = 32; -static void __meminit mm_compute_batch(void) +void mm_compute_batch(void) { u64 memsized_batch; s32 nr = num_present_cpus(); s32 batch = max_t(s32, nr*2, 32); - - /* batch size set to 0.4% of (total memory/#cpus), or max int32 */ - memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff); + unsigned long ram_pages = totalram_pages(); + + /* + * For policy of OVERCOMMIT_NEVER, set batch size to 0.4% + * of (total memory/#cpus), and lift it to 25% for other + * policies to easy the possible lock contention for percpu_counter + * vm_committed_as, while the max limit is INT_MAX + */ + if (sysctl_overcommit_memory == OVERCOMMIT_NEVER) + memsized_batch = min_t(u64, ram_pages/nr/256, INT_MAX); + else + memsized_batch = min_t(u64, ram_pages/nr/4, INT_MAX); vm_committed_as_batch = max_t(s32, memsized_batch, batch); } diff --git a/mm/util.c b/mm/util.c index 3de78e9..99936d3 100644 --- a/mm/util.c +++ b/mm/util.c @@ -729,6 +729,19 @@ int overcommit_ratio_handler(struct ctl_table *table, int write, return ret; } +int overcommit_policy_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, + loff_t *ppos) +{ + int ret; + + ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); + if (ret == 0 && write) + mm_compute_batch(); + + return ret; +} + int overcommit_kbytes_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
When checking a performance change for will-it-scale scalability mmap test [1], we found very high lock contention for spinlock of percpu counter 'vm_committed_as': 94.14% 0.35% [kernel.kallsyms] [k] _raw_spin_lock_irqsave 48.21% _raw_spin_lock_irqsave;percpu_counter_add_batch;__vm_enough_memory;mmap_region;do_mmap; 45.91% _raw_spin_lock_irqsave;percpu_counter_add_batch;__do_munmap; Actually this heavy lock contention is not always necessary. The 'vm_committed_as' needs to be very precise when the strict OVERCOMMIT_NEVER policy is set, which requires a rather small batch number for the percpu counter. So keep 'batch' number unchanged for strict OVERCOMMIT_NEVER policy, and lift it to 64X for OVERCOMMIT_ALWAYS and OVERCOMMIT_GUESS policies. Also add a sysctl handler to adjust it when the policy is reconfigured. Benchmark with the same testcase in [1] shows 53% improvement on a 8C/16T desktop, and 2097%(20X) on a 4S/72C/144T server. We tested with test platforms in 0day (server, desktop and laptop), and 80%+ platforms shows improvements with that test. And whether it shows improvements depends on if the test mmap size is bigger than the batch number computed. And if the lift is 16X, 1/3 of the platforms will show improvements, though it should help the mmap/unmap usage generally, as Michal Hocko mentioned: " I believe that there are non-synthetic worklaods which would benefit from a larger batch. E.g. large in memory databases which do large mmaps during startups from multiple threads. " [1] https://lore.kernel.org/lkml/20200305062138.GI5972@shao2-debian/ Signed-off-by: Feng Tang <feng.tang@intel.com> --- include/linux/mm.h | 2 ++ include/linux/mman.h | 4 ++++ kernel/sysctl.c | 2 +- mm/mm_init.c | 18 ++++++++++++++---- mm/util.c | 13 +++++++++++++ 5 files changed, 34 insertions(+), 5 deletions(-)