add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/block/blk-iocost.c
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@@ -232,7 +232,9 @@
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 	/* 1/64k is granular enough and can easily be handled w/ u32 */
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 	WEIGHT_ONE		= 1 << 16,
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+};
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+enum {
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 	/*
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 	 * As vtime is used to calculate the cost of each IO, it needs to
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 	 * be fairly high precision.  For example, it should be able to
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@@ -256,6 +258,11 @@
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 	VRATE_MIN		= VTIME_PER_USEC * VRATE_MIN_PPM / MILLION,
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 	VRATE_CLAMP_ADJ_PCT	= 4,
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+	/* switch iff the conditions are met for longer than this */
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+	AUTOP_CYCLE_NSEC	= 10LLU * NSEC_PER_SEC,
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+};
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+
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+enum {
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 	/* if IOs end up waiting for requests, issue less */
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 	RQ_WAIT_BUSY_PCT	= 5,
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@@ -293,9 +300,6 @@
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 	/* don't let cmds which take a very long time pin lagging for too long */
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 	MAX_LAGGING_PERIODS	= 10,
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-
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-	/* switch iff the conditions are met for longer than this */
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-	AUTOP_CYCLE_NSEC	= 10LLU * NSEC_PER_SEC,
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 	/*
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 	 * Count IO size in 4k pages.  The 12bit shift helps keeping
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@@ -872,9 +876,14 @@
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 	*page = *seqio = *randio = 0;
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-	if (bps)
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-		*page = DIV64_U64_ROUND_UP(VTIME_PER_SEC,
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-					   DIV_ROUND_UP_ULL(bps, IOC_PAGE_SIZE));
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+	if (bps) {
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+		u64 bps_pages = DIV_ROUND_UP_ULL(bps, IOC_PAGE_SIZE);
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+
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+		if (bps_pages)
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+			*page = DIV64_U64_ROUND_UP(VTIME_PER_SEC, bps_pages);
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+		else
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+			*page = 1;
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+	}
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 	if (seqiops) {
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 		v = DIV64_U64_ROUND_UP(VTIME_PER_SEC, seqiops);
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@@ -2417,6 +2426,7 @@
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 	u32 hwi, adj_step;
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 	s64 margin;
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 	u64 cost, new_inuse;
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+	unsigned long flags;
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 	current_hweight(iocg, NULL, &hwi);
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 	old_hwi = hwi;
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@@ -2435,11 +2445,11 @@
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 	    iocg->inuse == iocg->active)
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 		return cost;
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-	spin_lock_irq(&ioc->lock);
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+	spin_lock_irqsave(&ioc->lock, flags);
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 	/* we own inuse only when @iocg is in the normal active state */
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 	if (iocg->abs_vdebt || list_empty(&iocg->active_list)) {
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-		spin_unlock_irq(&ioc->lock);
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+		spin_unlock_irqrestore(&ioc->lock, flags);
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 		return cost;
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 	}
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@@ -2460,7 +2470,7 @@
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 	} while (time_after64(vtime + cost, now->vnow) &&
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 		 iocg->inuse != iocg->active);
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-	spin_unlock_irq(&ioc->lock);
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+	spin_unlock_irqrestore(&ioc->lock, flags);
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 	TRACE_IOCG_PATH(inuse_adjust, iocg, now,
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 			old_inuse, iocg->inuse, old_hwi, hwi);