| Message ID | 20220405234343.74045-9-kirill.shutemov@linux.intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm, x86/cc: Implement support for unaccepted memory | expand |
On 06.04.22 01:43, Kirill A. Shutemov wrote: > The counter increased every time kernel accepts a memory region. > > The counter allows to see if memory acceptation is still ongoing and > contributes to memory allocation latency. > Does it? See my other mail, can't we have the counter essentially not changing for a long time but still some unaccepted pages sitting at the tail of the freelists that will only get allocated+accepted under real memory pressure?
diff --git a/arch/x86/mm/unaccepted_memory.c b/arch/x86/mm/unaccepted_memory.c index 2f1c3c0375cd..7cfe0bd8d2be 100644 --- a/arch/x86/mm/unaccepted_memory.c +++ b/arch/x86/mm/unaccepted_memory.c @@ -32,6 +32,7 @@ void accept_memory(phys_addr_t start, phys_addr_t end) else panic("Cannot accept memory"); bitmap_clear(unaccepted_memory, rs, re - rs); + count_vm_events(ACCEPT_MEMORY, PMD_SIZE / PAGE_SIZE); } spin_unlock_irqrestore(&unaccepted_memory_lock, flags); } diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 16a0a4fd000b..6a468164a2f9 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -136,6 +136,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, #ifdef CONFIG_X86 DIRECT_MAP_LEVEL2_SPLIT, DIRECT_MAP_LEVEL3_SPLIT, +#endif +#ifdef CONFIG_UNACCEPTED_MEMORY + ACCEPT_MEMORY, #endif NR_VM_EVENT_ITEMS }; diff --git a/mm/vmstat.c b/mm/vmstat.c index b75b1a64b54c..4c9197f32406 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1397,6 +1397,9 @@ const char * const vmstat_text[] = { "direct_map_level2_splits", "direct_map_level3_splits", #endif +#ifdef CONFIG_UNACCEPTED_MEMORY + "accept_memory", +#endif #endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */ }; #endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA || CONFIG_MEMCG */
The counter increased every time kernel accepts a memory region. The counter allows to see if memory acceptation is still ongoing and contributes to memory allocation latency. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/mm/unaccepted_memory.c | 1 + include/linux/vm_event_item.h | 3 +++ mm/vmstat.c | 3 +++ 3 files changed, 7 insertions(+)