Hi Linus
>> I've seen this on the kernel and reminded one of my FIXMEs on the
>> USB code: upgradeable read locks. There's code which needs to
>> perform checks and lookup tables before doing stuff, and it is
>> quite ugly to have a write lock on hold until you decide if the
>> real write operation is going to be done or not.
Linus> If the above does work for people (or it works after a few
Linus> fixes) and somebody decides that he wants to use upgrade locks,
Linus> send me a patch back with the (possibly fixed) code.
I've found a simpler sollution which does what I need to
do. It doesn't need to use any special kind of lock, just the normal
ones. The code goes in, read locks, and then decides it has to
write. It upgrades the read lock to write lock, writes, releases the
write lock, and later (when due), releases the read lock.
What it is done is, when requesting the upgrade, wait until
there's only ONE reader holding the lock; this is our read lock, and
we can easily set the write bit. Then we can unlock with
write_unlock(), what will keep the read lock still held.
I have tested this in software (with a mixture of gdb and
paper), and it worked fine, BUT NOT ON REAL KERNEL OPERATION. I don't
own a SMP machine, so it'be nice if people could test it out; I know I
should provide a sample for an stress test, but know I have to leave
my house and won't be here for a loong while (quite a month). Perhaps
tomorrow I'll be able of scratching some.
I include the patch against 2.1.77 and a set of flowcharts I
made with xfig which helped me understanding the locking mechanism;
perhaps they may help people not to have a hard night as I had :)
Cheers
--Multipart_Sun_Jan_11_18:50:20_1998-1
Content-Type: application/octet-stream; type=patch
Content-Disposition: attachment; filename="upgradeable-read-locks.diff"
Content-Transfer-Encoding: 7bit
--- linux/include/asm-i386/spinlock.h.orig Sat Jan 10 15:53:08 1998
+++ linux/include/asm-i386/spinlock.h Sun Jan 11 18:39:11 1998
@@ -146,6 +146,77 @@
asm volatile("lock ; decl %0" \
:"=m" (__dummy_lock(&(rw)->lock)))
+/*
+ * Upgrade a read lock to a write lock.
+ *
+ * Use this function to upgrade a read lock owned by the calling
+ * process to a write lock. After that, you release the upgraded write
+ * lock with the same write_unlock() function; note the read lock is
+ * still there, and you must do read_unlock() for it to be released.
+ *
+ * We assume that *always*, when calling upgrade2write_read_lock(),
+ * the lock is at least read locked by us (1R). Behaviour is
+ * *undefined* when calling this function on locks in other states
+ * than read locked.
+ *
+ * Background
+ *
+ * You have to do a write somewhere, however, before, you need to do
+ * a lot of checks, but you need to keep all the data constant while
+ * checking (and writing). You could hold a write lock on everything,
+ * but if the checkings are lengthy, this could impact in the overall
+ * performance; the sollution is to upgrade the read lock to a write
+ * lock.
+ *
+ * When your flow has decided is time to write, it will ask for an
+ * upgrade. This upgrade will wait for the lock having just ONE read
+ * lock holder (our read lock) and then write lock it. Then you can
+ * do the writing and release the write lock. When you are finally
+ * done, you release the read lock.
+ *
+ * Lock State Operation Table
+ *
+ * LS: Lock state: U Unlocked
+ * W Write locked
+ * NR N read locks.
+ *
+ * Initial Action Performed
+ * LS
+ *
+ * 1R Write lock
+ * NR Block until 1R, then write lock
+ * W+1R Block until 1R, then write lock
+ * W+NR Block until 1R, then write lock
+ *
+ * All state transitions while waiting have been checked, using the
+ * following table (* means when the locks switches to the column's
+ * state, it performs as described by the Lock State Actio Table):
+ *
+ * Initial LS Switch to this state
+ * while waiting
+ *
+ * 1R NR W+1R W+NR
+ * 1R NA NA NA NA
+ * NR * NA * *
+ * W+1R * * NA *
+ * W+NR * * * NA
+ */
+
+#define upgrade2write_read_lock(rw) \
+ asm volatile( \
+ "\n1: lock; btsl $31,%0" \
+ "\n jc 4f" \
+ "\n2: testl $0x7ffffffe,%0" \
+ "\n jne 3f" \
+ "\n.section .text.lock,\"ax\"" \
+ "\n3: lock; btrl $31,%0" \
+ "\n4: testl $0xfffffffe,%0" \
+ "\n jnz 4b" \
+ "\n jmp 1b" \
+ "\n.previous" \
+ "\n" \
+ : "=m" (__dummy_lock (&(rw)->lock)))
+
#define write_lock(rw) \
asm volatile("\n1:\t" \
"lock ; btsl $31,%0\n\t" \
@@ -165,6 +236,8 @@
#define read_lock_irq(lock) do { __cli(); read_lock(lock); } while (0)
#define read_unlock_irq(lock) do { read_unlock(lock); __sti(); } while (0)
+#define upgrade2write_read_lock_irq(lock) \
+ do { __cli(); upgrade2write_read_lock(lock); } while (0)
#define write_lock_irq(lock) do { __cli(); write_lock(lock); } while (0)
#define write_unlock_irq(lock) do { write_unlock(lock); __sti(); } while (0)
@@ -172,6 +245,8 @@
do { __save_flags(flags); __cli(); read_lock(lock); } while (0)
#define read_unlock_irqrestore(lock, flags) \
do { read_unlock(lock); __restore_flags(flags); } while (0)
+#define upgrade2write_read_lock_irqsave(lock, flags) \
+ do { __save_flags(flags); __cli(); upgrade2write_read_lock(lock); } while (0)
#define write_lock_irqsave(lock, flags) \
do { __save_flags(flags); __cli(); write_lock(lock); } while (0)
#define write_unlock_irqrestore(lock, flags) \
Diff finished at Sun Jan 11 18:39:32
--Multipart_Sun_Jan_11_18:50:20_1998-1
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--Multipart_Sun_Jan_11_18:50:20_1998-1
Content-Type: text/plain; charset=US-ASCII
Linux-USB! http://peloncho.fis.ucm.es/~inaky/USB.html -
-
Inaky Perez Gonzalez -- PGP pubkey fingerprint -
inaky@peloncho.fis.ucm.es -- 8E 34 3A 62 64 99 E2 44 -
http://peloncho.fis.ucm.es/~inaky -- AD 7B 30 D9 DD FF 3E 4C -
--------------------------------- -- ----------------------- -
The loneliness of the long distance runner .....
--Multipart_Sun_Jan_11_18:50:20_1998-1--