From: Arnd Bergmann <arnd@arndb.de>
To: Vineet.Gupta1@synopsys.com
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de
Subject: Re: [RFC Patch v1 32/55] ARC: [optim] Cache "current" in Register r25
Date: Mon, 12 Nov 2012 13:50:12 +0000 [thread overview]
Message-ID: <201211121350.12810.arnd@arndb.de> (raw)
In-Reply-To: <1352720953-24321-2-git-send-email-vgupta@synopsys.com>
On Monday 12 November 2012, Vineet.Gupta1@synopsys.com wrote:
>
> endmenu # "Platform Board Configuration"
>
> +config ARC_CURR_IN_REG
> + bool "Dedicate Register r25 for current_task pointer"
> + default y
> + help
> + This reserved Register R25 to point to Current Task in
> + kernel mode. This saves memory access for each such access
> +
This looks like a useful feature if you have 32 GPRs, but why make it
optional? Are there cases where you would disable it?
Another alternative to caching "current" would be to cache the per-cpu
offset, and calculate current from that one.
Arnd
next prev parent reply other threads:[~2012-11-12 13:50 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-12 11:48 [RFC Patch v1 00/55] Addons to Synopsys ARC Linux kernel Port Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 32/55] ARC: [optim] Cache "current" in Register r25 Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 13:50 ` Arnd Bergmann [this message]
2012-11-15 10:22 ` Vineet Gupta
2012-11-15 10:22 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 33/55] ARC: ptrace support Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 13:51 ` Arnd Bergmann
2012-11-12 13:51 ` Arnd Bergmann
2012-11-15 10:24 ` Vineet Gupta
2012-11-15 10:24 ` Vineet Gupta
2012-11-15 11:56 ` Arnd Bergmann
2012-11-12 11:48 ` [RFC Patch v1 34/55] ARC: futex Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 35/55] ARC: oprofile support Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 36/55] ARC: ARCompact 2 levels IRQ (high/low priority) Handling Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 37/55] ARC: dynamic loadable module support Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 13:53 ` Arnd Bergmann
2012-11-15 10:28 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 38/55] ARC: Low level event capture/logging Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 13:55 ` Arnd Bergmann
2012-11-15 10:40 ` Vineet Gupta
2012-11-15 12:04 ` Arnd Bergmann
2012-12-20 6:22 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 39/55] ARC: kernel diagnostics: show_regs() etc Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 40/55] ARC: SMP support Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 41/55] ARC: dwarf2 stack unwinder Vineet.Gupta1
2012-11-12 11:48 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 42/55] ARC: stacktracing APIs based on dw2 unwinder Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 43/55] ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul) Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 44/55] ARC: kprobes support Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 45/55] ARC: unaligned access emulation Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 14:00 ` Arnd Bergmann
2012-12-20 6:59 ` Vineet Gupta
2012-12-20 10:30 ` Vineet Gupta
2012-12-20 10:34 ` Geert Uytterhoeven
2012-12-20 11:11 ` [PATCH] sysctl: some arch specific unaligned access knobs made generic Vineet.Gupta1
2012-12-20 11:11 ` [PATCH] sysctl: convert arch specific unaligned access regulators to generic ones Vineet.Gupta1
2013-01-03 6:47 ` [RESEND PATCH] Convert IA64 sysctl to generic Vineet Gupta
2013-01-03 6:47 ` Vineet Gupta
2013-01-03 6:47 ` [RESEND PATCH] sysctl: Enable IA64 "ignore-unaligned-usertrap" to be used cross-arch Vineet Gupta
2013-01-03 6:47 ` Vineet Gupta
2013-01-08 23:43 ` Tony Luck
2013-01-08 23:43 ` Tony Luck
2013-01-09 14:14 ` Vineet Gupta
2013-01-09 14:36 ` [PATCH v2] " Vineet Gupta
2013-01-09 18:55 ` Tony Luck
2013-01-09 18:55 ` Tony Luck
2013-01-09 21:03 ` Eric W. Biederman
2013-01-09 21:03 ` Eric W. Biederman
2013-01-10 4:13 ` Vineet Gupta
2013-01-03 6:59 ` [RESEND PATCH] Convert PARISC sysctl to be generic Vineet Gupta
2013-01-03 6:59 ` [RESEND PATCH] sysctl: Enable PARISC "unaligned-trap" to be used cross-arch Vineet Gupta
2013-01-15 22:03 ` Helge Deller
2013-01-15 22:03 ` Helge Deller
2012-12-20 8:08 ` [RFC Patch v1 45/55] ARC: unaligned access emulation Vineet Gupta
2012-12-20 8:51 ` Arnd Bergmann
2012-11-12 11:49 ` [RFC Patch v1 46/55] ARC: kgdb support Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 47/55] ARC: startup #2: Verbose Boot reporting / feature verification Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 48/55] ARC: [plat-arfpga] BVCI Latency Unit setup Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 14:02 ` Arnd Bergmann
2013-01-17 5:08 ` Vineet Gupta
2012-11-12 11:49 ` [RFC Patch v1 49/55] perf, ARC: Enable building perf tools for ARC Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 50/55] ARC: perf support (software counters only) Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 51/55] modpost: Ignore ARC specific non-alloc section Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-12-27 10:47 ` [RESEND PATCH] modpost: For ARC Port submission Vineet Gupta
2012-12-27 10:47 ` Vineet Gupta
2012-12-27 10:47 ` [PATCH] modpost: Ignore ARC specific non-alloc sections Vineet Gupta
2012-12-27 20:48 ` Sam Ravnborg
2012-12-28 4:42 ` Vineet Gupta
2012-12-28 4:42 ` Vineet Gupta
2013-01-02 0:49 ` Rusty Russell
2013-01-02 0:49 ` Rusty Russell
2013-01-02 5:16 ` Vineet Gupta
2012-11-12 11:49 ` [RFC Patch v1 52/55] ARC: Support for single cycle Close Coupled Mem (CCM) Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 14:10 ` Arnd Bergmann
2013-01-17 5:09 ` Vineet Gupta
2013-01-17 10:53 ` Arnd Bergmann
2012-11-12 11:49 ` [RFC Patch v1 53/55] ARC: Hostlink Pseudo-Driver for Metaware Debugger Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 54/55] ARC: [plat-arcfpga] defconfig Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 55/55] ARC: Add self to MAINTAINERS Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1
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