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From: Wandun Chen <chenwandun1@gmail.com>
To: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org,
	pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
	tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, x86@kernel.org, robh@kernel.org,
	saravanak@kernel.org, akpm@linux-foundation.org,
	baoquan.he@linux.dev, rppt@kernel.org, pasha.tatashin@soleen.com,
	pratyush@kernel.org, m.szyprowski@samsung.com
Cc: mark.rutland@arm.com, kernel@xen0n.name, alex@ghiti.fr,
	hpa@zytor.com, ruirui.yang@linux.dev, robin.murphy@arm.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, loongarch@lists.linux.dev,
	linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
	kexec@lists.infradead.org, linux-mm@kvack.org,
	iommu@lists.linux.dev
Subject: [PATCH v6 10/10] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header
Date: Wed,  2 Sep 2026 15:31:16 +0800	[thread overview]
Message-ID: <20260902073116.802752-11-chenwandun1@gmail.com> (raw)
In-Reply-To: <20260902073116.802752-1-chenwandun1@gmail.com>

From: Wandun Chen <chenwandun@lixiang.com>

Reserve regions (for GPU, DSP, ...) carry no data useful for crash
analysis. Exclude MEMBLOCK_NODUMP regions from the vmcore ELF header to
reduce vmcore size and capture time. crash_should_skip_region() now also
returns true for MEMBLOCK_NODUMP.

Signed-off-by: Wandun Chen <chenwandun@lixiang.com>
Tested-by: Meijing Zhao <zhaomeijing@lixiang.com>
---
 kernel/crash_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index bd64cf585795..b0e618e13588 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -270,10 +270,10 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
 	return 0;
 }
 
-/* Exclude NOMAP regions from the vmcore. */
+/* Exclude NOMAP and NODUMP regions from the vmcore. */
 static bool crash_should_skip_region(struct memblock_region *reg)
 {
-	return memblock_is_nomap(reg);
+	return memblock_is_nomap(reg) || memblock_is_nodump(reg);
 }
 
 static struct crash_mem *alloc_cmem(unsigned int nr_ranges)
-- 
2.43.0


WARNING: multiple messages have this Message-ID (diff)
From: Wandun Chen <chenwandun1@gmail.com>
To: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org,
	pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
	tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, x86@kernel.org, robh@kernel.org,
	saravanak@kernel.org, akpm@linux-foundation.org,
	baoquan.he@linux.dev, rppt@kernel.org, pasha.tatashin@soleen.com,
	pratyush@kernel.org, m.szyprowski@samsung.com
Cc: mark.rutland@arm.com, kernel@xen0n.name, alex@ghiti.fr,
	hpa@zytor.com, ruirui.yang@linux.dev, robin.murphy@arm.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, loongarch@lists.linux.dev,
	linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
	kexec@lists.infradead.org, linux-mm@kvack.org,
	iommu@lists.linux.dev
Subject: [PATCH v6 10/10] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header
Date: Wed,  2 Sep 2026 15:31:16 +0800	[thread overview]
Message-ID: <20260902073116.802752-11-chenwandun1@gmail.com> (raw)
In-Reply-To: <20260902073116.802752-1-chenwandun1@gmail.com>

From: Wandun Chen <chenwandun@lixiang.com>

Reserve regions (for GPU, DSP, ...) carry no data useful for crash
analysis. Exclude MEMBLOCK_NODUMP regions from the vmcore ELF header to
reduce vmcore size and capture time. crash_should_skip_region() now also
returns true for MEMBLOCK_NODUMP.

Signed-off-by: Wandun Chen <chenwandun@lixiang.com>
Tested-by: Meijing Zhao <zhaomeijing@lixiang.com>
---
 kernel/crash_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index bd64cf585795..b0e618e13588 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -270,10 +270,10 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
 	return 0;
 }
 
-/* Exclude NOMAP regions from the vmcore. */
+/* Exclude NOMAP and NODUMP regions from the vmcore. */
 static bool crash_should_skip_region(struct memblock_region *reg)
 {
-	return memblock_is_nomap(reg);
+	return memblock_is_nomap(reg) || memblock_is_nodump(reg);
 }
 
 static struct crash_mem *alloc_cmem(unsigned int nr_ranges)
-- 
2.43.0


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  parent reply	other threads:[~2026-09-02  7:33 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-02  7:31 [PATCH v6 00/10] kdump: reduce vmcore size and capture time Wandun Chen
2026-09-02  7:31 ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 01/10] mm: memblock: add missing HugeTLB flag name Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:43   ` sashiko-bot
2026-09-02  7:31 ` [PATCH v6 02/10] riscv: build crash_mem ranges from memblock instead of resource tree Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 03/10] crash_core: fold duplicated memblock arch hooks into the weak default Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 04/10] crash_core: serialize crash header preparation against hotplug Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 05/10] crash_core: replace for_each_mem_range() with for_each_mem_region() Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 06/10] memblock: introduce MEMBLOCK_NODUMP flag Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 07/10] of: reserved_mem: add dumpable flag to opt-in vmcore Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  7:31 ` [PATCH v6 08/10] of: reserved_mem: mark /reserved-memory entries with MEMBLOCK_NODUMP Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-03  7:32   ` Marek Szyprowski
2026-09-03  7:32     ` Marek Szyprowski
2026-09-02  7:31 ` [PATCH v6 09/10] of: reserved_mem: mark /memreserve/ entries as MEMBLOCK_NODUMP Wandun Chen
2026-09-02  7:31   ` Wandun Chen
2026-09-02  9:02   ` sashiko-bot
2026-09-03  7:32   ` Marek Szyprowski
2026-09-03  7:32     ` Marek Szyprowski
2026-09-02  7:31 ` Wandun Chen [this message]
2026-09-02  7:31   ` [PATCH v6 10/10] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header Wandun Chen
2026-09-02  8:53 ` [PATCH v6 00/10] kdump: reduce vmcore size and capture time Baoquan He
2026-09-02  8:53   ` Baoquan He
2026-09-03  7:05   ` Wandun
2026-09-03  7:05     ` Wandun
2026-09-03  7:31     ` Baoquan He
2026-09-03  7:31       ` Baoquan He
2026-09-03  7:43       ` Wandun
2026-09-03  7:43         ` Wandun
2026-09-03  9:38         ` Baoquan He
2026-09-03  9:38           ` Baoquan He
2026-09-04 11:08           ` Chen Wandun
2026-09-04 11:08             ` Chen Wandun

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