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b=C6yRUtKainglgoeYlvvtQJHp8J/jkJrkuthx9uHUC4P3h7qPikKKwAnk1F96dqGCW LWYLnVqGOP9pfvX5kCJoyJLToQkuSD4Iyk/N1GxDKDzG4ugb8rWwajnJJjk0ezElRo SqiW5YNE+991xK381T+QkIdr5nXP6dyc+AzcRTps= Date: Thu, 26 Dec 2024 15:01:27 -0800 From: Andrew Morton To: Suren Baghdasaryan Cc: kent.overstreet@linux.dev, yuzhao@google.com, 00107082@163.com, quic_zhenhuah@quicinc.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH 2/2] alloc_tag: skip pgalloc_tag_swap if profiling is disabled Message-Id: <20241226150127.73d1b2a08cf31dac1a900c1e@linux-foundation.org> In-Reply-To: <20241226211639.1357704-2-surenb@google.com> References: <20241226211639.1357704-1-surenb@google.com> <20241226211639.1357704-2-surenb@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B94401C000C X-Stat-Signature: osxqdsqh5oy9qhe9h73yn9af4yttwgme X-HE-Tag: 1735254008-535985 X-HE-Meta: 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 PExkyQKs pSXKFu2skt6CUmMvRMeGl8gHpJsd575Ol3JVjIyQ2eIEPB+HgauOE8BVcl9cPxZzW+J0F0L+yJDYVjfZ81Iz+44pnB4Y7mfFQFEsDPyg+z8QojB0vEJuykxHt571Ag+XHJBY/9NTBfx3iSA7iXdVtqD27GxLFUQzywB/FjbosImSQehaQCmn96qlf1ei8YpE8kKzSLzZSHLcgjlRgjBjpFoIJo2SbUE08nhK5S/EfJDtAJ4kreVW59Z0dYTBauev8wo57CqLF5LAOggbaAjrfbFryPCAm95gHHHMXO2/pWp9Y4o28BcWoEkv0h0GFND7I3PotAn88+MkpzcZGGj81/zb28jG4Uu3O74o68VpaoNT82BWl2TwYDvZtbQ== 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: On Thu, 26 Dec 2024 13:16:39 -0800 Suren Baghdasaryan wrote: > When memory allocation profiling is disabled, there is no need to swap > allocation tags during migration. Skip it to avoid unnecessary overhead. > > Fixes: e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()") > Signed-off-by: Suren Baghdasaryan > Cc: stable@vger.kernel.org Are these changes worth backporting? Some indication of how much difference the patches make would help people understand why we're proposing a backport.