Re: [PATCH 0/2] Add percpu smp cacheline align section

On Fri, 4 May 2007, Fenghua Yu wrote:

> This is follow-up for Suresh's runqueue align in smp patch at:
> http://www.uwsg.iu.edu/hypermail/linux/kernel/0704.1/0340.html
> 
> The patches place all of smp cacheline aligned percpu data into 
> .data.percpu.cacheline_aligned_in_smp. Other percpu data is still in 
> data.percpu section. The patches can reduce cache line access in SMP and 
> reduce alignment gap waste. The patches also define PERCPU macro for 
> vmlinux.lds.S for code clean up.

Ummm... The per cpu area is for exclusive use of a particular processor. 
If there is contention in the per cpu area then a data object needs to be 
removed from the per cpu area because the object is *not* accessed only 
from a certain cpu.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Follow-Ups:
- Re: [PATCH 0/2] Add percpu smp cacheline align section
  - From: "Siddha, Suresh B" <[email protected]>

References:
- [PATCH 0/2] Add percpu smp cacheline align section
  - From: Fenghua Yu <[email protected]>

Prev by Date: Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]
Next by Date: [PATCH 1/2] ATA: sata_promise, do not freeze ports
Previous by thread: [PATCH 0/2] Add percpu smp cacheline align section
Next by thread: Re: [PATCH 0/2] Add percpu smp cacheline align section
Index(es):
- Date
- Thread

[Index of Archives] [Kernel Newbies] [Netfilter] [Bugtraq] [Photo] [Stuff] [Gimp] [Yosemite News] [MIPS Linux] [ARM Linux] [Linux Security] [Linux RAID] [Video 4 Linux] [Linux for the blind] [Linux Resources]