vm_area_alloc_pages() contains the only voluntary reschedule points along vmalloc() allocation path. They are needed to ensure forward progress on PREEMPT_NONE kernels under contention for vmap metadata (e.g. alloc_vmap_area()). However, yielding should only be done if the given GFP flags allow blocking. This patch avoids calling cond_resched() when allocation context is non-blocking(GFP_ATOMIC, GFP_NOWAIT). Signed-off-by: Uladzislau Rezki (Sony) --- mm/vmalloc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 49a0f81930a8..b77e8be75f10 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -3633,7 +3633,9 @@ vm_area_alloc_pages(gfp_t gfp, int nid, pages + nr_allocated); nr_allocated += nr; - cond_resched(); + + if (gfpflags_allow_blocking(gfp)) + cond_resched(); /* * If zero or pages were obtained partly, @@ -3675,7 +3677,9 @@ vm_area_alloc_pages(gfp_t gfp, int nid, for (i = 0; i < (1U << order); i++) pages[nr_allocated + i] = page + i; - cond_resched(); + if (gfpflags_allow_blocking(gfp)) + cond_resched(); + nr_allocated += 1U << order; } -- 2.47.3