The patch titled
Subject: mm: add preempt points into __purge_vmap_area_lazy()
has been added to the -mm tree. Its filename is
mm-add-preempt-points-into-__purge_vmap_area_lazy.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-preempt-points-into-__purge_vmap_area_lazy.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-preempt-points-into-__purge_vmap_area_lazy.patch
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------------------------------------------------------
From: Joel Fernandes <joelaf@xxxxxxxxxx>
Subject: mm: add preempt points into __purge_vmap_area_lazy()
Use cond_resched_lock to avoid holding the vmap_area_lock for a
potentially long time and thus creating bad latencies for various
workloads.
[hch: split from a larger patch by Joel, wrote the crappy changelog]
Link: http://lkml.kernel.org/r/1479474236-4139-11-git-send-email-hch@xxxxxx
Signed-off-by: Joel Fernandes <joelaf@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Tested-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: John Dias <joaodias@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff -puN mm/vmalloc.c~mm-add-preempt-points-into-__purge_vmap_area_lazy mm/vmalloc.c
--- a/mm/vmalloc.c~mm-add-preempt-points-into-__purge_vmap_area_lazy
+++ a/mm/vmalloc.c
@@ -628,7 +628,7 @@ static bool __purge_vmap_area_lazy(unsig
struct llist_node *valist;
struct vmap_area *va;
struct vmap_area *n_va;
- int nr = 0;
+ bool do_free = false;
lockdep_assert_held(&vmap_purge_lock);
@@ -638,18 +638,22 @@ static bool __purge_vmap_area_lazy(unsig
start = va->va_start;
if (va->va_end > end)
end = va->va_end;
- nr += (va->va_end - va->va_start) >> PAGE_SHIFT;
+ do_free = true;
}
- if (!nr)
+ if (!do_free)
return false;
- atomic_sub(nr, &vmap_lazy_nr);
flush_tlb_kernel_range(start, end);
spin_lock(&vmap_area_lock);
- llist_for_each_entry_safe(va, n_va, valist, purge_list)
+ llist_for_each_entry_safe(va, n_va, valist, purge_list) {
+ int nr = (va->va_end - va->va_start) >> PAGE_SHIFT;
+
__free_vmap_area(va);
+ atomic_sub(nr, &vmap_lazy_nr);
+ cond_resched_lock(&vmap_area_lock);
+ }
spin_unlock(&vmap_area_lock);
return true;
}
_
Patches currently in -mm which might be from joelaf@xxxxxxxxxx are
mm-add-preempt-points-into-__purge_vmap_area_lazy.patch
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