linux-kernel - Re: [PATCH v4 3/7] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb

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Date:	Tue, 15 May 2012 09:06:11 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Borislav Petkov <bp@...64.org>
CC:	rob@...dley.net, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, arnd@...db.de, rostedt@...dmis.org,
	fweisbec@...il.com, jeremy@...p.org, gregkh@...uxfoundation.org,
	borislav.petkov@....com, riel@...hat.com, luto@....edu,
	avi@...hat.com, len.brown@...el.com, dhowells@...hat.com,
	fenghua.yu@...el.com, ak@...ux.intel.com, cpw@....com,
	steiner@....com, akpm@...ux-foundation.org, penberg@...nel.org,
	hughd@...gle.com, rientjes@...gle.com,
	kosaki.motohiro@...fujitsu.com, n-horiguchi@...jp.nec.com,
	paul.gortmaker@...driver.com, trenn@...e.de, tj@...nel.org,
	oleg@...hat.com, axboe@...nel.dk, a.p.zijlstra@...llo.nl,
	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/7] x86/flush_tlb: try flush_tlb_single one by one
 in flush_tlb_range


> --
> 
> Oh well, enough games :-).
> 




Thanks for your input. but actually, total 3 labels doesn't looks good.
Maybe the following lines can meet your expectation.

---
void __flush_tlb_range(struct mm_struct *mm, unsigned long start,
				unsigned long end, unsigned long vmflag)
{
	unsigned long addr;
	unsigned act_entries, tlb_entries = 0;

	preempt_disable();
	if (current->active_mm != mm)
		goto flush_all;

	if (!current->mm) {
		leave_mm(smp_processor_id());
		goto flush_all;
	}

	if (end == TLB_FLUSH_ALL ||
			tlb_flushall_shift == (u16)TLB_FLUSH_ALL) {
		local_flush_tlb();
		goto flush_all;
	}

	if (vmflag & VM_EXEC)
		tlb_entries = tlb_lli_4k[ENTRIES];
	else
		tlb_entries = tlb_lld_4k[ENTRIES];
	act_entries = mm->total_vm > tlb_entries ? tlb_entries : mm->total_vm;

	if ((end - start) >> PAGE_SHIFT > act_entries >> tlb_flushall_shift)
		local_flush_tlb();
	else {
		if (has_large_page(mm, start, end)) {
			local_flush_tlb();
			goto flush_all;
		}
		for (addr = start; addr <= end;	addr += PAGE_SIZE)
			__flush_tlb_single(addr);

		if (cpumask_any_but(mm_cpumask(mm),
				smp_processor_id()) < nr_cpu_ids)
			flush_tlb_others(mm_cpumask(mm), mm, start, end);
		preempt_enable();
		return;
	}

flush_all:
	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
		flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
	preempt_enable();
}


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