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Thu, 07 Aug 2025 04:01:05 -0700 (PDT) Date: Thu, 7 Aug 2025 13:01:00 +0200 From: Marco Elver To: "Uladzislau Rezki (Sony)" Cc: linux-mm@kvack.org, Andrew Morton , Vlastimil Babka , Michal Hocko , Baoquan He , LKML , Alexander Potapenko , kasan-dev@googlegroups.com Subject: Re: [PATCH 0/8] __vmalloc() and no-block support Message-ID: References: <20250807075810.358714-1-urezki@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250807075810.358714-1-urezki@gmail.com> User-Agent: Mutt/2.2.13 (2024-03-09) On Thu, Aug 07, 2025 at 09:58AM +0200, Uladzislau Rezki (Sony) wrote: > Hello. > > This is a second series of making __vmalloc() to support GFP_ATOMIC and > GFP_NOWAIT flags. It tends to improve the non-blocking behaviour. > > The first one can be found here: > > https://lore.kernel.org/all/20250704152537.55724-1-urezki@gmail.com/ > > that was an RFC. Using this series for testing i have not found more > places which can trigger: scheduling during atomic. Though there is > one which requires attention. I will explain in [1]. > > Please note, non-blocking gets improved in the __vmalloc() call only, > i.e. vmalloc_huge() still contains in its paths many cond_resched() > points and can not be used as non-blocking as of now. > > [1] The vmap_pages_range_noflush() contains the kmsan_vmap_pages_range_noflush() > external implementation for KCSAN specifically which is hard coded to GFP_KERNEL. > The kernel should be built with CONFIG_KCSAN option. To me it looks like not > straight forward to run such kernel on my box, therefore i need more time to > investigate what is wrong with CONFIG_KCSAN and my env. KMSAN or KCSAN? [+Cc KMSAN maintainers]