sched/isolation: Add basic isolcpus flags
Add flags to control NOHZ and domain isolation from "isolcpus=", in order to centralize the isolation features to a common interface. Domain isolation remains the default so not to break the existing isolcpus boot paramater behaviour. Further flags in the future may include 0hz (1hz tick offload) and timers, workqueue, RCU, kthread, watchdog, likely all merged together in a common flag ("async"?). In any case, this will have to be modifiable by cpusets. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Christoph Lameter <cl@linux.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Wanpeng Li <kernellwp@gmail.com> Link: http://lkml.kernel.org/r/1509072159-31808-12-git-send-email-frederic@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -11,6 +11,7 @@
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/static_key.h>
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#include <linux/ctype.h>
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DEFINE_STATIC_KEY_FALSE(housekeeping_overriden);
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EXPORT_SYMBOL_GPL(housekeeping_overriden);
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@ -126,6 +127,29 @@ __setup("nohz_full=", housekeeping_nohz_full_setup);
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static int __init housekeeping_isolcpus_setup(char *str)
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{
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return housekeeping_setup(str, HK_FLAG_DOMAIN);
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unsigned int flags = 0;
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while (isalpha(*str)) {
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if (!strncmp(str, "nohz,", 5)) {
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str += 5;
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flags |= HK_FLAG_TICK;
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continue;
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}
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if (!strncmp(str, "domain,", 7)) {
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str += 7;
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flags |= HK_FLAG_DOMAIN;
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continue;
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}
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pr_warn("isolcpus: Error, unknown flag\n");
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return 0;
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}
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/* Default behaviour for isolcpus without flags */
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if (!flags)
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flags |= HK_FLAG_DOMAIN;
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return housekeeping_setup(str, flags);
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}
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__setup("isolcpus=", housekeeping_isolcpus_setup);
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