Re: [PATCH] clocksource: Store reg field within struct clocksource
From: Måns Rullgård
Date: Wed Nov 18 2015 - 08:51:17 EST
Marc Gonzalez <marc_gonzalez@xxxxxxxxxxxxxxxx> writes:
> Since 'struct clocksource' is ____cacheline_aligned, gcc must insert
> a lot of padding between reg and clksrc in 'struct clocksource_mmio'
> (for example, L1_CACHE_BYTES = 64 on ARMv7).
> Storing reg within 'struct clocksource' removes unnecessary padding,
> and reg can then be grouped with other hot data.
Can you demonstrate a difference with this change? Not saying it's bad,
but it's always good to have numbers.
> A nice side-effect of this patch is making container_of() unnecessary,
> which makes the code a bit simpler.
You really need to get used to that construct.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/