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Subject[PATCH][cfq-cgroups][12/12] Interface for parameter of cfq driver data
Date
From 8bdb6a318fbc266cf359aea699c97a964baeff35 Mon Sep 17 00:00:00 2001
From: Satoshi UCHIDA <s-uchida@ap.jp.nec.com>
Date: Fri, 31 Oct 2008 20:49:57 +0900
Subject: [PATCH][cfq-cgroups] Interface for parameter of cfq driver data

This patch add a interface for parameter of cfq driver data.


Signed-off-by: Satoshi UCHIDA <s-uchida@ap.jp.nec.com>

---
block/cfq-cgroup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 58 insertions(+), 1 deletions(-)
diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c
index 4938fa0..776874d 100644
--- a/block/cfq-cgroup.c
+++ b/block/cfq-cgroup.c
@@ -1028,6 +1028,62 @@ STORE_FUNCTION(cfq_cgroup_slice_async_rq_store, cfq_slice_async_rq, 1,
STORE_FUNCTION(cfq_cgroup_ioprio_store, ioprio, 0, CFQ_CGROUP_MAX_IOPRIO, 0);
#undef STORE_FUNCTION

+static ssize_t
+cfq_cgroup_var_show2(unsigned int var, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n", var);
+}
+
+static ssize_t
+cfq_cgroup_var_store2(unsigned int *var, const char *page, size_t count)
+{
+ int err;
+ char *p = (char *) page;
+ unsigned long new_var;
+
+ err = strict_strtoul(p, 10, &new_var);
+ if (err)
+ count = 0;
+
+ *var = new_var;
+
+ return count;
+}
+
+#define SHOW_FUNCTION2(__FUNC, __VAR, __CONV) \
+static ssize_t __FUNC(elevator_t *e, char *page) \
+{ \
+ struct cfq_data *cfqd = e->elevator_data; \
+ struct cfq_driver_data *cfqdd = cfqd->cfqdd; \
+ unsigned int __data = __VAR; \
+ if (__CONV) \
+ __data = jiffies_to_msecs(__data); \
+ return cfq_cgroup_var_show2(__data, (page)); \
+}
+SHOW_FUNCTION2(cfq_cgroup_slice_cgroup_show, cfqdd->cfq_cgroup_slice, 1);
+#undef SHOW_FUNCTION2
+
+#define STORE_FUNCTION2(__FUNC, __PTR, MIN, MAX, __CONV) \
+static ssize_t __FUNC(elevator_t *e, const char *page, size_t count) \
+{ \
+ struct cfq_data *cfqd = e->elevator_data; \
+ struct cfq_driver_data *cfqdd = cfqd->cfqdd; \
+ unsigned int __data; \
+ int ret = cfq_cgroup_var_store2(&__data, (page), count); \
+ if (__data < (MIN)) \
+ __data = (MIN); \
+ else if (__data > (MAX)) \
+ __data = (MAX); \
+ if (__CONV) \
+ *(__PTR) = msecs_to_jiffies(__data); \
+ else \
+ *(__PTR) = __data; \
+ return ret; \
+}
+STORE_FUNCTION2(cfq_cgroup_slice_cgroup_store, &cfqdd->cfq_cgroup_slice, 1,
+ UINT_MAX, 1);
+#undef STORE_FUNCTION2
+
#define CFQ_CGROUP_ATTR(name) \
__ATTR(name, S_IRUGO|S_IWUSR, cfq_cgroup_##name##_show, \
cfq_cgroup_##name##_store)
@@ -1043,6 +1099,7 @@ static struct elv_fs_entry cfq_cgroup_attrs[] = {
CFQ_CGROUP_ATTR(slice_async_rq),
CFQ_CGROUP_ATTR(slice_idle),
CFQ_CGROUP_ATTR(ioprio),
+ CFQ_CGROUP_ATTR(slice_cgroup),
__ATTR_NULL
};

--
1.5.6.5



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