Re: [patch V2 0/2] genirq, proc: Speedup /proc/stat interrupt statistics
- Date: Fri, 8 Feb 2019 17:40:30 +0000
- From: Marc Zyngier <marc.zyngier@xxxxxxx>
- Subject: Re: [patch V2 0/2] genirq, proc: Speedup /proc/stat interrupt statistics
On 08/02/2019 13:48, Thomas Gleixner wrote:
> Waiman reported that on large systems with a large amount of interrupts the
> readout of /proc/stat takes a long time to sum up the interrupt
> statistics. In principle this is not a problem. but for unknown reasons
> some enterprise quality software reads /proc/stat with a high frequency.
> The reason for this is that interrupt statistics are accounted per cpu. So
> the /proc/stat logic has to sum up the interrupt stats for each interrupt.
> The following series addresses this by making the interrupt statitics code
> in the core generate the sum directly and by making the loop in the
> /proc/stat read function smarter.
> V1 -> V2: Address review feedback: undo struct layout changes, make
> variables unsigned and add test results to the changelog.
> fs/proc/stat.c | 29 ++++++++++++++++++++++++++---
> include/linux/irqdesc.h | 1 +
> kernel/irq/chip.c | 12 ++++++++++--
> kernel/irq/internals.h | 8 +++++++-
> kernel/irq/irqdesc.c | 7 ++++++-
> 5 files changed, 50 insertions(+), 7 deletions(-)
Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Jazz is not dead. It just smells funny...