linux

iv/linux

History

Nadav Amit 6035152d8e x86/mm/tlb: Open-code on_each_cpu_cond_mask() for tlb_is_not_lazy()

Open-code on_each_cpu_cond_mask() in native_flush_tlb_others() to
optimize the code. Open-coding eliminates the need for the indirect branch
that is used to call is_lazy(), and in CPUs that are vulnerable to
Spectre v2, it eliminates the retpoline. In addition, it allows to use a
preallocated cpumask to compute the CPUs that should be.

This would later allow us not to adapt on_each_cpu_cond_mask() to
support local and remote functions.

Note that calling tlb_is_not_lazy() for every CPU that needs to be
flushed, as done in native_flush_tlb_multi() might look ugly, but it is
equivalent to what is currently done in on_each_cpu_cond_mask().
Actually, native_flush_tlb_multi() does it more efficiently since it
avoids using an indirect branch for the matter.

Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20210220231712.2475218-4-namit@vmware.com

2021-03-06 12:59:09 +01:00

alpha

io_uring-worker.v3-2021-02-25

2021-02-27 08:29:02 -08:00

arc

arch: setup PF_IO_WORKER threads like PF_KTHREAD

2021-02-21 17:25:22 -07:00

arm

xen: branch for v5.12-rc2

2021-03-04 11:24:47 -08:00

arm64

io_uring-worker.v3-2021-02-25