linux-kernel - [PATCH/RFC v2 0/3] tlb: mmu_gather: use batched table free if possible

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Message-Id: <20211218185205.1744125-1-nikita.yushchenko@virtuozzo.com>
Date:   Sat, 18 Dec 2021 21:52:03 +0300
From:   Nikita Yushchenko <nikita.yushchenko@...tuozzo.com>
To:     Will Deacon <will@...nel.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>, Sam Ravnborg <sam@...nborg.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, kernel@...nvz.org
Subject: [PATCH/RFC v2 0/3] tlb: mmu_gather: use batched table free if possible

In mmu_gather code, the final table free in __tlb_remove_table_free()
executes a loop, calling arch hook __tlb_remove_table() to free each table
individually.

Several architectures use free_page_and_swap_cache() as their
__tlb_remove_table() implementation. Calling that in loop results into
individual calls to put_page() for each page being freed.

This patchset refactors the code to issue a single release_pages() call
in this case. This is expected to have better performance, especially when
memcg accounting is enabled.

Nikita Yushchenko (3):
  tlb: mmu_gather: introduce CONFIG_MMU_GATHER_TABLE_FREE_COMMON
  mm/swap: introduce free_pages_and_swap_cache_nolru()
  tlb: mmu_gather: use batched table free if possible

 arch/Kconfig                 |  3 +++
 arch/arm/Kconfig             |  1 +
 arch/arm/include/asm/tlb.h   |  5 -----
 arch/arm64/Kconfig           |  1 +
 arch/arm64/include/asm/tlb.h |  5 -----
 arch/x86/Kconfig             |  1 +
 arch/x86/include/asm/tlb.h   | 14 --------------
 include/asm-generic/tlb.h    |  5 +++++
 include/linux/swap.h         |  5 ++++-
 mm/mmu_gather.c              | 25 ++++++++++++++++++++++---
 mm/swap_state.c              | 29 ++++++++++++++++++++++-------
 11 files changed, 59 insertions(+), 35 deletions(-)

-- 
2.30.2