From: Kirill Tkhai <ktk...@virtuozzo.com>
Patchset description:
Make kstat_glob::swap_in percpu and cleanup
This patchset continues escaping of kstat_glb_lock
and makes swap_in percpu. Also, newly unused primitives
are dropped and reduced memory usage by using percpu
seqcount (instead of separate percpu seqcount for every
kstat percpu variable).
Kirill Tkhai (4):
kstat: Make kstat_glob::swap_in percpu
kstat: Drop global kstat_lat_struct
kstat: Drop cpu argument in KSTAT_LAT_PCPU_ADD()
kstat: Make global percpu kstat_pcpu_seq instead of percpu seq for every
variable
==========================================
This patch description:
Using of global local is not good for scalability.
Better we make swap_in percpu, and it will be updated
lockless like other statistics (e.g., page_in).
Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
Ported to vz8:
- Dropped all patchset but this patch, since it is already partially included
- Introduced start in do_swap_page to use it for kstat_glob.swap_in
(cherry picked from ed033a381e01996f7f8061d9838d1c9ec6b38d96)
Signed-off-by: Andrey Zhadchenko <andrey.zhadche...@virtuozzo.com>
---
mm/memory.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/memory.c b/mm/memory.c
index b64f317..3a48379 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3037,7 +3037,9 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
int locked;
int exclusive = 0;
vm_fault_t ret = 0;
+ cycles_t start;
+ start = get_cycles();
if (!pte_unmap_same(vma->vm_mm, vmf->pmd, vmf->pte, vmf->orig_pte))
goto out;
@@ -3226,6 +3228,10 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
unlock:
pte_unmap_unlock(vmf->pte, vmf->ptl);
out:
+ local_irq_disable();
+ KSTAT_LAT_PCPU_ADD(&kstat_glob.swap_in, get_cycles() - start);
+ local_irq_enable();
+
return ret;
out_nomap:
mem_cgroup_cancel_charge(page, memcg, false);
--
1.8.3.1
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