Am 26.04.2018 um 17:06 schrieb Michel Dänzer:
From: Michel Dänzer <michel.daenzer@xxxxxxx>
GFP_TRANSHUGE tries very hard to allocate huge pages, which can result
in long delays with high memory pressure. I have observed firefox
freezing for up to around a minute due to this while restic was taking
a full system backup.
Since we don't really need huge pages, use GFP_TRANSHUGE_LIGHT |
__GFP_NORETRY instead, in order to fail quickly when there are no huge
pages available.
Yeah, that goes into the direction Felix already suggested as well.
Set __GFP_KSWAPD_RECLAIM as well, in order for huge pages to be freed
up in the background if necessary.
And that is even better, thanks.
With these changes, I'm no longer seeing freezes during a restic backup.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michel Dänzer <michel.daenzer@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Regards,
Christian.
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 11 ++++++++---
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 3 ++-
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 2ce91272b111..6794f15461d9 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -914,7 +914,8 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
while (npages >= HPAGE_PMD_NR) {
gfp_t huge_flags = gfp_flags;
- huge_flags |= GFP_TRANSHUGE;
+ huge_flags |= GFP_TRANSHUGE_LIGHT | __GFP_NORETRY |
+ __GFP_KSWAPD_RECLAIM;
huge_flags &= ~__GFP_MOVABLE;
huge_flags &= ~__GFP_COMP;
p = alloc_pages(huge_flags, HPAGE_PMD_ORDER);
@@ -1033,11 +1034,15 @@ int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
GFP_USER | GFP_DMA32, "uc dma", 0);
ttm_page_pool_init_locked(&_manager->wc_pool_huge,
- GFP_TRANSHUGE & ~(__GFP_MOVABLE | __GFP_COMP),
+ (GFP_TRANSHUGE_LIGHT | __GFP_NORETRY |
+ __GFP_KSWAPD_RECLAIM) &
+ ~(__GFP_MOVABLE | __GFP_COMP),
"wc huge", order);
ttm_page_pool_init_locked(&_manager->uc_pool_huge,
- GFP_TRANSHUGE & ~(__GFP_MOVABLE | __GFP_COMP)
+ (GFP_TRANSHUGE_LIGHT | __GFP_NORETRY |
+ __GFP_KSWAPD_RECLAIM) &
+ ~(__GFP_MOVABLE | __GFP_COMP)
, "uc huge", order);
_manager->options.max_size = max_pages;
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index 291b04213ec5..5a551158c289 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -910,7 +910,8 @@ static gfp_t ttm_dma_pool_gfp_flags(struct ttm_dma_tt *ttm_dma, bool huge)
gfp_flags |= __GFP_ZERO;
if (huge) {
- gfp_flags |= GFP_TRANSHUGE;
+ gfp_flags |= GFP_TRANSHUGE_LIGHT | __GFP_NORETRY |
+ __GFP_KSWAPD_RECLAIM;
gfp_flags &= ~__GFP_MOVABLE;
gfp_flags &= ~__GFP_COMP;
}
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