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Mon, 15 Sep 2025 06:40:46 -0700 (PDT) Received: from localhost.localdomain ([2001:9b1:d5a0:a500::24b]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-573c8330e54sm1150719e87.63.2025.09.15.06.40.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 06:40:46 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki Subject: [PATCH v2 04/10] mm/vmalloc: Avoid cond_resched() when blocking is not permitted Date: Mon, 15 Sep 2025 15:40:34 +0200 Message-ID: <20250915134041.151462-5-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250915134041.151462-1-urezki@gmail.com> References: <20250915134041.151462-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 1cwoembgiwiwjt4fo5s7xb15ers7h7sm X-Rspam-User: X-Rspamd-Queue-Id: 5B63140011 X-Rspamd-Server: rspam04 X-HE-Tag: 1757943648-121313 X-HE-Meta: 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 WdAeSbpZ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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