From: Sean Christopherson <seanjc@google.com>
To: Yury Norov <yury.norov@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org, Jan Kara <jack@suse.cz>,
Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>,
Matthew Wilcox <willy@infradead.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>,
Alexey Klimov <klimov.linux@gmail.com>,
Bart Van Assche <bvanassche@acm.org>,
Sergey Shtylyov <s.shtylyov@omp.ru>
Subject: Re: [PATCH v3 13/35] KVM: x86: hyper-v: optimize and cleanup kvm_hv_process_stimers()
Date: Tue, 12 Dec 2023 09:22:36 -0800 [thread overview]
Message-ID: <ZXiW3AgIENf7whei@google.com> (raw)
In-Reply-To: <20231212022749.625238-14-yury.norov@gmail.com>
On Mon, Dec 11, 2023, Yury Norov wrote:
> The function traverses stimer_pending_bitmap in a for-loop bit by bit.
> Simplify it by using atomic find_and_set_bit().
for_each_test_and_clear_bit(), not find_and_set_bit().
It might also be nice to call out that there are only 4 bits, i.e. that using
for_each_test_and_clear_bit() will still generate inline code. Definitely not
mandatory though, just nice to have (I highly doubt this code would be sensitive
to using less optimal code).
> While here, refactor the logic by decreasing indentation level.
>
> CC: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Yury Norov <yury.norov@gmail.com>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> arch/x86/kvm/hyperv.c | 40 ++++++++++++++++++++--------------------
This doesn't conflict with any of the in-flight Hyper-V changes, so with a fixed
changelog, feel free to take this through the bitmap tree.
Acked-by: Sean Christopherson <seanjc@google.com>
next prev parent reply other threads:[~2023-12-12 17:22 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 2:27 [PATCH v3 00/35] bitops: add atomic find_bit() operations Yury Norov
2023-12-12 2:27 ` [PATCH v3 01/35] lib/find: add atomic find_bit() primitives Yury Norov
2023-12-12 2:27 ` [PATCH v3 02/35] lib/find: add test for atomic find_bit() ops Yury Norov
2023-12-12 2:27 ` [PATCH v3 03/35] lib/sbitmap; optimize __sbitmap_get_word() by using find_and_set_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 04/35] watch_queue: optimize post_one_notification() by using find_and_clear_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 05/35] sched: add cpumask_find_and_set() and use it in __mm_cid_get() Yury Norov
2023-12-12 14:14 ` Mathieu Desnoyers
2023-12-12 2:27 ` [PATCH v3 06/35] mips: sgi-ip30: optimize heart_alloc_int() by using find_and_set_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 07/35] sparc: optimize alloc_msi() " Yury Norov
2023-12-12 2:27 ` [PATCH v3 08/35] perf/arm: use atomic find_bit() API Yury Norov
2023-12-12 2:27 ` [PATCH v3 09/35] drivers/perf: optimize ali_drw_get_counter_idx() by using find_and_set_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 10/35] dmaengine: idxd: optimize perfmon_assign_event() Yury Norov
2023-12-12 2:30 ` Fenghua Yu
2023-12-12 2:27 ` [PATCH v3 11/35] ath10k: optimize ath10k_snoc_napi_poll() Yury Norov
2023-12-12 2:27 ` [PATCH v3 12/35] wifi: rtw88: optimize the driver by using atomic iterator Yury Norov
2023-12-12 2:27 ` [PATCH v3 13/35] KVM: x86: hyper-v: optimize and cleanup kvm_hv_process_stimers() Yury Norov
2023-12-12 17:22 ` Sean Christopherson [this message]
2023-12-12 17:35 ` Yury Norov
2023-12-12 2:27 ` [PATCH v3 14/35] PCI: hv: Optimize hv_get_dom_num() by using find_and_set_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 15/35] scsi: core: optimize scsi_evt_emit() by using an atomic iterator Yury Norov
2023-12-12 2:27 ` [PATCH v3 16/35] scsi: mpi3mr: optimize the driver by using find_and_set_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 17/35] scsi: qedi: optimize qedi_get_task_idx() " Yury Norov
2023-12-12 2:27 ` [PATCH v3 18/35] powerpc: optimize arch code by using atomic find_bit() API Yury Norov
2023-12-12 2:27 ` [PATCH v3 19/35] iommu: optimize subsystem " Yury Norov
2023-12-12 2:27 ` [PATCH v3 20/35] media: radio-shark: optimize the driver " Yury Norov
2023-12-12 2:27 ` [PATCH v3 21/35] sfc: " Yury Norov
2023-12-12 2:27 ` [PATCH v3 22/35] tty: nozomi: optimize interrupt_handler() Yury Norov
2023-12-12 2:27 ` [PATCH v3 23/35] usb: cdc-acm: optimize acm_softint() Yury Norov
2023-12-12 2:27 ` [PATCH v3 24/35] block: null_blk: replace get_tag() with a generic find_and_set_bit_lock() Yury Norov
2023-12-12 2:27 ` [PATCH v3 25/35] RDMA/rtrs: optimize __rtrs_get_permit() by using find_and_set_bit_lock() Yury Norov
2023-12-12 2:27 ` [PATCH v3 26/35] mISDN: optimize get_free_devid() Yury Norov
2023-12-12 2:27 ` [PATCH v3 27/35] media: em28xx: cx231xx: optimize drivers by using find_and_set_bit() Yury Norov
2023-12-12 2:27 ` [PATCH v3 28/35] ethernet: rocker: optimize ofdpa_port_internal_vlan_id_get() Yury Norov
2023-12-12 2:27 ` [PATCH v3 29/35] serial: sc12is7xx: optimize sc16is7xx_alloc_line() Yury Norov
2023-12-12 2:27 ` [PATCH v3 30/35] bluetooth: optimize cmtp_alloc_block_id() Yury Norov
2023-12-12 2:27 ` [PATCH v3 31/35] net: smc: optimize smc_wr_tx_get_free_slot_index() Yury Norov
2023-12-12 13:26 ` Wen Gu
2023-12-12 2:27 ` [PATCH v3 32/35] ALSA: use atomic find_bit() functions where applicable Yury Norov
2023-12-12 2:27 ` [PATCH v3 33/35] m68k: optimize get_mmu_context() Yury Norov
2023-12-12 2:27 ` [PATCH v3 34/35] microblaze: " Yury Norov
2023-12-12 2:27 ` [PATCH v3 35/35] sh: mach-x3proto: optimize ilsel_enable() Yury Norov
2023-12-16 21:48 ` [PATCH v3 00/35] bitops: add atomic find_bit() operations Yury Norov
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