Re: POSIX timer syscalls

george anzinger
2003-03-07T08:14:24Z

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David Mosberger wrote:
>>>>>>On Thu, 06 Mar 2003 17:39:16 -0800, george anzinger <george@mvista.com> said:
>
>
> George> Ok, I will fix all the above and shoot you a patch. I
> George> assume you can test it on a 64-bit platform. Right?
>
The patch to fix idr is attached. Cleans up the int/long confusion
and also rearranges a couple of structures to honor the sizes involved.

> Sure, except I don't have a test-program. ;-)
>
That is why you should visit the High-res-timers web site (see URL
below) and get the "support" patch. It installs in you kernel tree at
.../Documentation/high-res-timers/ and has test programs as well as
man pages, readme files etc.

By the way, I am seeing some reports from the clock_nanosleep test
about sleeping too long or too short. The too long appears to be just
not being able to preempt what ever else is running. The too short
(on the x86) is, I believe, due to the fact that more that 1/HZ is
clocked on the wall clock each jiffie.

Try this:

time sleep 60

On the x86 it reports less than 60, NOT good.

--
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml

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diff -urP -I '\$Id:.*Exp \$' -X /usr/src/patch.exclude linux-2.5.64-kb/include/linux/idr.h linux/include/linux/idr.h
--- linux-2.5.64-kb/include/linux/idr.h 2003-03-05 15:09:48.000000000 -0800
+++ linux/include/linux/idr.h 2003-03-06 18:04:26.000000000 -0800
@@ -25,9 +25,12 @@

#define IDR_MASK ((1 << IDR_BITS)-1)

-/* Leave the possibility of an incomplete final layer */
-#define MAX_LEVEL (BITS_PER_LONG - RESERVED_ID_BITS + IDR_BITS - 1) / IDR_BITS
-#define MAX_ID_SHIFT (BITS_PER_LONG - RESERVED_ID_BITS)
+/* Leave the possibility of an incomplete final layer
+ * Note we will return a 32-bit int, not a long, thus the
+ * 32 below
+*/
+#define MAX_LEVEL (32 - RESERVED_ID_BITS + IDR_BITS - 1) / IDR_BITS
+#define MAX_ID_SHIFT (32 - RESERVED_ID_BITS)
#define MAX_ID_BIT (1L << MAX_ID_SHIFT)
#define MAX_ID_MASK (MAX_ID_BIT - 1)

@@ -36,15 +39,15 @@

struct idr_layer {
unsigned long bitmap; // A zero bit means "space here"
- int count; // When zero, we can release it
struct idr_layer *ary[1<<IDR_BITS];
+ int count; // When zero, we can release it
};

struct idr {
struct idr_layer *top;
- int layers;
- long count;
struct idr_layer *id_free;
+ long count;
+ int layers;
int id_free_cnt;
spinlock_t lock;
};
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diff -urP -I '\$Id:.*Exp \$' -X /usr/src/patch.exclude linux-2.5.64-kb/lib/idr.c linux/lib/idr.c
--- linux-2.5.64-kb/lib/idr.c 2003-03-05 15:09:50.000000000 -0800
+++ linux/lib/idr.c 2003-03-06 18:04:29.000000000 -0800
@@ -150,7 +150,7 @@

static inline int sub_alloc(struct idr *idp, int shift, void *ptr)
{
- long n, v = 0;
+ int n, v = 0;
struct idr_layer *p;
struct idr_layer **pa[MAX_LEVEL];
struct idr_layer ***paa = &pa[0];
@@ -211,7 +211,7 @@

int idr_get_new(struct idr *idp, void *ptr)
{
- long v;
+ int v;

if (idp->id_free_cnt < idp->layers + 1)
return (-1);
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