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Received: from [2601:1c2:980:9ec0::df2f] by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pcIkG-00CHEk-1L; Wed, 15 Mar 2023 04:28:12 +0000 Message-ID: <53b1194f-ae4a-87c9-5670-d1dbc298242f@infradead.org> Date: Tue, 14 Mar 2023 21:28:09 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH v1] docs/mm: extend ksm doc Content-Language: en-US To: Bagas Sanjaya , Stefan Roesch , kernel-team@fb.com Cc: linux-mm@kvack.org, riel@surriel.com, mhocko@suse.com, david@redhat.com, linux-doc@vger.kernel.org, akpm@linux-foundation.org, hannes@cmpxchg.org References: <20230314204557.3863923-1-shr@devkernel.io> From: Randy Dunlap In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6C16880003 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: 1f76uj46kgtfuzd974imygj6qkac8yfq X-HE-Tag: 1678854499-557430 X-HE-Meta: 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 TswKMhlK ILWnZMhVjGdRtWFS9GZ40hXp1sox5EeeNLOPr28eK6jtUJLhgCwNbkBEIN3zGVYRV9IF+T3CXromUuePpaaQVjSkCLgfiTiqr1XcvLXdeCqp5m396pVb7rExLolsuMAPILGg7hZps4aXJIOBtRhK5bbkxUUzpDxr8/r2PgedDmWw/78KGg3GIM//LTgM1PshTrGiVN6noVxYOtBB0vrK+5wNa3w== 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: Hi-- On 3/14/23 20:59, Bagas Sanjaya wrote: > On Tue, Mar 14, 2023 at 01:45:57PM -0700, Stefan Roesch wrote: >> +to cancel that advice and restore unshared pages: whereupon KSM >> +unmerges whatever is merged for that process. Note: this unmerging call >> +may suddenly require more memory than is available - possibly failing >> +with EAGAIN, but more probably arousing the Out-Of-Memory killer. > > "... to disable KSM and let it unmerges ... . Note that this unmerging > call may exhaust memory and triggers OOM killer." I can't tell exactly what is being proposed here, but "let it unmerges" is not good & proper... Perhaps fewer ellipses and more complete sentences are in order. >> +However, if the system is dedicated to running multiple jobs within the >> +same security domain, there is a usecase where multiple instances of the >> +same job are running inside a safe shared security domain and using the >> +same sensitive data. > > "... it is possible for multiple instances ... and share the same > sensitive data." > > Thanks. > -- ~Randy