Re: [RFC PATCH 0/3] Implement IRQ stack on ARM64

2015-09-07 Thread Jungseok Lee
On Sep 7, 2015, at 11:33 PM, James Morse wrote: > On 04/09/15 15:23, Jungseok Lee wrote: >> ARM64 kernel allocates 16KB kernel stack when creating a process. In case >> of low memory platforms with tough workloads on userland, this order-2 >> allocation request reaches to memory pressure and

Re: [RFC PATCH 0/3] Implement IRQ stack on ARM64

2015-09-07 Thread James Morse
On 04/09/15 15:23, Jungseok Lee wrote: > ARM64 kernel allocates 16KB kernel stack when creating a process. In case > of low memory platforms with tough workloads on userland, this order-2 > allocation request reaches to memory pressure and performance degradation > simultaenously since VM page

Re: [RFC PATCH 0/3] Implement IRQ stack on ARM64

2015-09-07 Thread Jungseok Lee
On Sep 7, 2015, at 11:33 PM, James Morse wrote: > On 04/09/15 15:23, Jungseok Lee wrote: >> ARM64 kernel allocates 16KB kernel stack when creating a process. In case >> of low memory platforms with tough workloads on userland, this order-2 >> allocation request reaches to memory pressure and

Re: [RFC PATCH 0/3] Implement IRQ stack on ARM64

2015-09-07 Thread James Morse
On 04/09/15 15:23, Jungseok Lee wrote: > ARM64 kernel allocates 16KB kernel stack when creating a process. In case > of low memory platforms with tough workloads on userland, this order-2 > allocation request reaches to memory pressure and performance degradation > simultaenously since VM page

[RFC PATCH 0/3] Implement IRQ stack on ARM64

2015-09-04 Thread Jungseok Lee
ARM64 kernel allocates 16KB kernel stack when creating a process. In case of low memory platforms with tough workloads on userland, this order-2 allocation request reaches to memory pressure and performance degradation simultaenously since VM page allocator falls into slowpath frequently, which

[RFC PATCH 0/3] Implement IRQ stack on ARM64

2015-09-04 Thread Jungseok Lee
ARM64 kernel allocates 16KB kernel stack when creating a process. In case of low memory platforms with tough workloads on userland, this order-2 allocation request reaches to memory pressure and performance degradation simultaenously since VM page allocator falls into slowpath frequently, which