From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Will Deacon <will@kernel.org>, Kees Cook <keescook@chromium.org>,
Ingo Molnar <mingo@kernel.org>,
Elena Reshetova <elena.reshetova@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Hanjun Guo <guohanjun@huawei.com>,
Jan Glauber <jglauber@marvell.com>
Subject: [PATCH v2 0/6] Rework REFCOUNT_FULL using atomic_fetch_* operations
Date: Tue, 27 Aug 2019 17:31:58 +0100 [thread overview]
Message-ID: <20190827163204.29903-1-will@kernel.org> (raw)
Hi all,
This is version two of the patches I previously posted here:
https://lkml.kernel.org/r/20190802101000.12958-1-will@kernel.org
Changes since v1 include:
* Avoid duplicate WARNs when incrementing from zero
* Some crude lktdm perf results to motivate the change:
# perf stat -r 3 -B -- echo {ATOMIC,REFCOUNT}_TIMING >/sys/kernel/debug/provoke-crash/DIRECT
# arm64
ATOMIC_TIMING: 46.50451 +- 0.00134 seconds time elapsed ( +- 0.00% )
REFCOUNT_TIMING (REFCOUNT_FULL, mainline): 77.57522 +- 0.00982 seconds time elapsed ( +- 0.01% )
REFCOUNT_TIMING (REFCOUNT_FULL, this series): 48.7181 +- 0.0256 seconds time elapsed ( +- 0.05% )
# x86
ATOMIC_TIMING: 31.6225 +- 0.0776 seconds time elapsed ( +- 0.25% )
REFCOUNT_TIMING (!REFCOUNT_FULL, mainline/x86 asm): 31.6689 +- 0.0901 seconds time elapsed ( +- 0.28% )
REFCOUNT_TIMING (REFCOUNT_FULL, mainline): 53.203 +- 0.138 seconds time elapsed ( +- 0.26% )
REFCOUNT_TIMING (REFCOUNT_FULL, this series): 31.7408 +- 0.0486 seconds time elapsed ( +- 0.15% )
Cheers,
Will
Cc: Kees Cook <keescook@chromium.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Jan Glauber <jglauber@marvell.com>
--->8
Will Deacon (6):
lib/refcount: Define constants for saturation and max refcount values
lib/refcount: Ensure integer operands are treated as signed
lib/refcount: Remove unused refcount_*_checked() variants
lib/refcount: Move bulk of REFCOUNT_FULL implementation into header
lib/refcount: Improve performance of generic REFCOUNT_FULL code
lib/refcount: Consolidate REFCOUNT_{MAX,SATURATED} definitions
drivers/misc/lkdtm/refcount.c | 8 --
include/linux/refcount.h | 236 +++++++++++++++++++++++++++++++++++++----
lib/refcount.c | 237 +-----------------------------------------
3 files changed, 218 insertions(+), 263 deletions(-)
--
2.11.0
next reply other threads:[~2019-08-27 16:32 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-27 16:31 Will Deacon [this message]
2019-08-27 16:31 ` [PATCH v2 1/6] lib/refcount: Define constants for saturation and max refcount values Will Deacon
2019-08-27 16:32 ` [PATCH v2 2/6] lib/refcount: Ensure integer operands are treated as signed Will Deacon
2019-08-27 16:32 ` [PATCH v2 3/6] lib/refcount: Remove unused refcount_*_checked() variants Will Deacon
2019-08-27 16:32 ` [PATCH v2 4/6] lib/refcount: Move bulk of REFCOUNT_FULL implementation into header Will Deacon
2019-08-27 16:32 ` [PATCH v2 5/6] lib/refcount: Improve performance of generic REFCOUNT_FULL code Will Deacon
2019-08-27 16:32 ` [PATCH v2 6/6] lib/refcount: Consolidate REFCOUNT_{MAX,SATURATED} definitions Will Deacon
2019-08-27 17:51 ` [PATCH v2 0/6] Rework REFCOUNT_FULL using atomic_fetch_* operations Kees Cook
2019-08-28 7:30 ` Peter Zijlstra
2019-08-28 14:14 ` Will Deacon
2019-08-28 21:03 ` Kees Cook
2019-08-31 17:48 ` Ard Biesheuvel
2019-08-31 19:02 ` Kees Cook
2019-08-31 20:54 ` Ard Biesheuvel
2019-09-06 13:43 ` Will Deacon
2019-09-07 1:57 ` Hanjun Guo
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