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authorRusty Russell <rusty@rustcorp.com.au>2007-07-26 23:42:52 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-28 22:54:33 -0400
commit6c8dca5d53f95009d4fff00195bf38f277dc4366 (patch)
tree60cc83cf949d6e598e6dc80dc668aebd42c65540 /drivers/lguest/lg.h
parenta8a11f06973fa63ad692a8f97694cb5eeb70b3f3 (diff)
Provide timespec to guests rather than jiffies clock.
A non-periodic clock_event_device and the "jiffies" clock don't mix well: tick_handle_periodic() can go into an infinite loop. Currently lguest guests use the jiffies clock when the TSC is unusable. Instead, make the Host write the current time into the lguest page on every interrupt. This doesn't cost much but is more precise and at least as accurate as the jiffies clock. It also gets rid of the GET_WALLCLOCK hypercall. Also, delay setting sched_clock until our clock is set up, otherwise the early printk timestamps can go backwards (not harmful, just ugly). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/lguest/lg.h')
-rw-r--r--drivers/lguest/lg.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index 269116eee85f..64f0abed317c 100644
--- a/drivers/lguest/lg.h
+++ b/drivers/lguest/lg.h
@@ -256,6 +256,7 @@ unsigned long get_dma_buffer(struct lguest *lg, unsigned long key,
256 256
257/* hypercalls.c: */ 257/* hypercalls.c: */
258void do_hypercalls(struct lguest *lg); 258void do_hypercalls(struct lguest *lg);
259void write_timestamp(struct lguest *lg);
259 260
260/*L:035 261/*L:035
261 * Let's step aside for the moment, to study one important routine that's used 262 * Let's step aside for the moment, to study one important routine that's used