diff options
| author | Sean Christopherson <seanjc@google.com> | 2025-05-16 16:07:33 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-06-20 13:52:40 -0700 |
| commit | 8394b32faecd9c63b3c436e78e62519e9548e530 (patch) | |
| tree | 99916a243538f029d3c51c22735e706d7019448e /include | |
| parent | 46a4bfd0ae480cabbacc56fe0d8f91cbe229c7ce (diff) | |
irqbypass: Use xarray to track producers and consumers
Track IRQ bypass producers and consumers using an xarray to avoid the O(2n)
insertion time associated with walking a list to check for duplicate
entries, and to search for an partner.
At low (tens or few hundreds) total producer/consumer counts, using a list
is faster due to the need to allocate backing storage for xarray. But as
count creeps into the thousands, xarray wins easily, and can provide
several orders of magnitude better latency at high counts. E.g. hundreds
of nanoseconds vs. hundreds of milliseconds.
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: David Matlack <dmatlack@google.com>
Cc: Like Xu <like.xu.linux@gmail.com>
Cc: Binbin Wu <binbin.wu@linux.intel.com>
Reported-by: Yong He <alexyonghe@tencent.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217379
Link: https://lore.kernel.org/all/20230801115646.33990-1-likexu@tencent.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/r/20250516230734.2564775-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/irqbypass.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/include/linux/irqbypass.h b/include/linux/irqbypass.h index b28197c87483..cd64fcaa88fe 100644 --- a/include/linux/irqbypass.h +++ b/include/linux/irqbypass.h @@ -33,7 +33,6 @@ struct irq_bypass_consumer; /** * struct irq_bypass_producer - IRQ bypass producer definition - * @node: IRQ bypass manager private list management * @eventfd: eventfd context used to match producers and consumers * @consumer: The connected consumer (NULL if no connection) * @irq: Linux IRQ number for the producer device @@ -47,7 +46,6 @@ struct irq_bypass_consumer; * for a physical device assigned to a VM. */ struct irq_bypass_producer { - struct list_head node; struct eventfd_ctx *eventfd; struct irq_bypass_consumer *consumer; int irq; @@ -61,7 +59,6 @@ struct irq_bypass_producer { /** * struct irq_bypass_consumer - IRQ bypass consumer definition - * @node: IRQ bypass manager private list management * @eventfd: eventfd context used to match producers and consumers * @producer: The connected producer (NULL if no connection) * @add_producer: Connect the IRQ consumer to an IRQ producer @@ -75,7 +72,6 @@ struct irq_bypass_producer { * portions of the interrupt handling to the VM. */ struct irq_bypass_consumer { - struct list_head node; struct eventfd_ctx *eventfd; struct irq_bypass_producer *producer; |