From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 94B5D3A262 for ; Tue, 19 Dec 2023 20:49:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="oVnucibv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15971C433C7; Tue, 19 Dec 2023 20:49:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1703018967; bh=MZCGpy6eeHkBAJEgqvwsRvXKOAibn8eSs1naW3TNN3w=; h=Date:To:From:Subject:From; b=oVnucibvmtuK12EUxyZ+SkQH+lPOGdsb29ObuvSQtb3QQJoF5vhauZTHsJk1otpDI N0H72ir1zqD2HuG/22DQrETvNb7hK3wVeDMaepDchAL63qexwK9/JBr5jyhwIiRk/k xVP1lA1qJl7fvqNvqNDHL9NII+jLQZ+VlFLM6Mik= Date: Tue, 19 Dec 2023 12:49:26 -0800 To: mm-commits@vger.kernel.org,vgoyal@redhat.com,tiwai@suse.de,tglx@linutronix.de,seanjc@google.com,mingo@redhat.com,hpa@zytor.com,hbathini@linux.ibm.com,dyoung@redhat.com,dave.hansen@linux.intel.com,bp@alien8.de,bhe@redhat.com,ytcoode@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: + crash_core-optimize-crash_exclude_mem_range.patch added to mm-nonmm-unstable branch Message-Id: <20231219204927.15971C433C7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: crash_core: optimize crash_exclude_mem_range() has been added to the -mm mm-nonmm-unstable branch. Its filename is crash_core-optimize-crash_exclude_mem_range.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/crash_core-optimize-crash_exclude_mem_range.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Yuntao Wang Subject: crash_core: optimize crash_exclude_mem_range() Date: Wed, 20 Dec 2023 00:34:18 +0800 Because memory ranges in mem->ranges are stored in ascending order, when we detect `p_end < start`, we can break the for loop early, as the subsequent memory ranges must also be outside the range we are looking for. Link: https://lkml.kernel.org/r/20231219163418.108591-1-ytcoode@gmail.com Signed-off-by: Yuntao Wang Cc: Baoquan He Cc: Borislav Petkov (AMD) Cc: Dave Hansen Cc: Dave Young Cc: Hari Bathini Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Sean Christopherson Cc: Takashi Iwai Cc: Thomas Gleixner Cc: Vivek Goyal Signed-off-by: Andrew Morton --- kernel/crash_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/kernel/crash_core.c~crash_core-optimize-crash_exclude_mem_range +++ a/kernel/crash_core.c @@ -575,9 +575,12 @@ int crash_exclude_mem_range(struct crash p_start = mstart; p_end = mend; - if (p_start > end || p_end < start) + if (p_start > end) continue; + if (p_end < start) + break; + /* Truncate any area outside of range */ if (p_start < start) p_start = start; _ Patches currently in -mm which might be from ytcoode@gmail.com are kexec-use-align-macro-instead-of-open-coding-it.patch x86-kexec-simplify-the-logic-of-mem_region_callback.patch x86-crash-remove-the-unused-image-parameter-from-prepare_elf_headers.patch x86-crash-use-sz_1m-macro-instead-of-hardcoded-value.patch crash_core-fix-and-simplify-the-logic-of-crash_exclude_mem_range.patch x86-crash-fix-potential-cmem-ranges-array-overflow.patch crash_core-optimize-crash_exclude_mem_range.patch kexec-modify-the-meaning-of-the-end-parameter-in-kimage_is_destination_range.patch kexec_file-fix-incorrect-temp_start-value-in-locate_mem_hole_top_down.patch