Re: [PATCH v5] arm64: Introduce IRQ stack

2015-10-21 Thread Jungseok Lee
On Oct 21, 2015, at 1:04 AM, James Morse wrote: > On 20/10/15 16:05, Jungseok Lee wrote: >> On Oct 20, 2015, at 7:05 PM, James Morse wrote: >>> On 17/10/15 15:27, Jungseok Lee wrote: diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c index 9f17ec0..13fe8f4 100644 --- a/ar

Re: [PATCH v5] arm64: Introduce IRQ stack

2015-10-20 Thread James Morse
On 20/10/15 16:05, Jungseok Lee wrote: > On Oct 20, 2015, at 7:05 PM, James Morse wrote: >> On 17/10/15 15:27, Jungseok Lee wrote: >>> diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c >>> index 9f17ec0..13fe8f4 100644 >>> --- a/arch/arm64/kernel/irq.c >>> +++ b/arch/arm64/kernel/irq.c

Re: [PATCH v5] arm64: Introduce IRQ stack

2015-10-20 Thread Jungseok Lee
On Oct 20, 2015, at 7:05 PM, James Morse wrote: > Hi Jungseok, Hi James, > On 17/10/15 15:27, Jungseok Lee wrote: >> Currently, kernel context and interrupts are handled using a single >> kernel stack navigated by sp_el1. This forces a system to use 16KB >> stack, not 8KB one. This restriction ma

Re: [PATCH v5] arm64: Introduce IRQ stack

2015-10-20 Thread Jungseok Lee
On Oct 19, 2015, at 3:54 PM, AKASHI Takahiro wrote: Hi Akashi, > On 10/17/2015 11:27 PM, Jungseok Lee wrote: >> Currently, kernel context and interrupts are handled using a single >> kernel stack navigated by sp_el1. This forces a system to use 16KB >> stack, not 8KB one. This restriction makes l

Re: [PATCH v5] arm64: Introduce IRQ stack

2015-10-20 Thread James Morse
Hi Jungseok, On 17/10/15 15:27, Jungseok Lee wrote: > Currently, kernel context and interrupts are handled using a single > kernel stack navigated by sp_el1. This forces a system to use 16KB > stack, not 8KB one. This restriction makes low memory platforms > suffer from memory pressure accompanied

Re: [PATCH v5] arm64: Introduce IRQ stack

2015-10-18 Thread AKASHI Takahiro
On 10/17/2015 11:27 PM, Jungseok Lee wrote: Currently, kernel context and interrupts are handled using a single kernel stack navigated by sp_el1. This forces a system to use 16KB stack, not 8KB one. This restriction makes low memory platforms suffer from memory pressure accompanied by performance

[PATCH v5] arm64: Introduce IRQ stack

2015-10-17 Thread Jungseok Lee
Currently, kernel context and interrupts are handled using a single kernel stack navigated by sp_el1. This forces a system to use 16KB stack, not 8KB one. This restriction makes low memory platforms suffer from memory pressure accompanied by performance degradation. This patch addresses the issue