linux-kernel - [PATCH v3 0/3] arm64: mm: Do not defer reserve

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Message-ID: <20220411092455.1461-1-wangkefeng.wang@huawei.com>
Date:   Mon, 11 Apr 2022 17:24:52 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <catalin.marinas@....com>, <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <vijayb@...ux.microsoft.com>, <f.fainelli@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v3 0/3] arm64: mm: Do not defer reserve_crashkernel()

Commit 031495635b46 ("arm64: Do not defer reserve_crashkernel() for
platforms with no DMA memory zones"), this lets the kernel benifit
due to BLOCK_MAPPINGS, we could do more if ZONE_DMA and ZONE_DMA32
enabled.

1) Don't defer reserve_crashkernel() if only ZONE_DMA32
2) Don't defer reserve_crashkernel() if ZONE_DMA with dma_force_32bit
   kernel parameter(newly added)

Here is another case to show the benefit of the block mapping.

Unixbench benchmark result shows between the block mapping and page mapping.
----------------+------------------+-------------------
        	| block mapping    |   page mapping    
----------------+------------------+-------------------
Process Creation|  5,030.7         |    4,711.8       
(in unixbench)  |                  |                   
----------------+------------------+-------------------

note: RODATA_FULL_DEFAULT_ENABLED is not enabled

v3:
- renaming crashkernel_could_early_reserve() to crashkernel_early_reserve() 
- drop dma32_phys_limit, directly use max_zone_phys(32)
- fix no previous prototype issue
- add RB of Vijay to patch2/3
v2 resend:
- fix build error reported-by lkp
v2:
- update patch1 according to Vijay and Florian, and RB of Vijay
- add new patch2

Kefeng Wang (3):
  arm64: mm: Do not defer reserve_crashkernel() if only ZONE_DMA32
  arm64: mm: Don't defer reserve_crashkernel() with dma_force_32bit
  arm64: mm: Cleanup useless parameters in zone_sizes_init()

 arch/arm64/include/asm/kexec.h |  1 +
 arch/arm64/mm/init.c           | 60 ++++++++++++++++++++++++----------
 arch/arm64/mm/mmu.c            |  6 ++--
 3 files changed, 46 insertions(+), 21 deletions(-)

-- 
2.26.2