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kernel
xen-printf-rate-limit.patch
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File xen-printf-rate-limit.patch of Package kernel
Index: xen/arch/x86/mm.c =================================================================== --- xen.orig/arch/x86/mm.c +++ xen/arch/x86/mm.c @@ -109,9 +109,13 @@ #include <public/memory.h> #ifdef VERBOSE -#define MEM_LOG(_f, _a...) \ - printk("DOM%u: (file=mm.c, line=%d) " _f "\n", \ - current->domain->domain_id , __LINE__ , ## _a ) +#define MEM_LOG(_f, _a...) \ + do { \ + if (printk_ratelimit()) { \ + printk("DOM%u: (file=mm.c, line=%d) " _f "\n", \ + current->domain->domain_id , __LINE__ , ## _a ); \ + } \ + } while (0) #else #define MEM_LOG(_f, _a...) ((void)0) #endif Index: xen/drivers/char/console.c =================================================================== --- xen.orig/drivers/char/console.c +++ xen/drivers/char/console.c @@ -4,6 +4,10 @@ * Emergency console I/O for Xen and the domain-0 guest OS. * * Copyright (c) 2002-2004, K A Fraser. + * + * Added printf_ratelimit + * Taken from Linux - Author: Andi Kleen (net_ratelimit) + * Ported to Xen - Steven Rostedt - Red Hat */ #include <stdarg.h> @@ -420,6 +424,52 @@ int console_getc(void) return serial_getc(sercon_handle); } +/* + * printk rate limiting, lifted from Linux. + * + * This enforces a rate limit: not more than one kernel message + * every printf_ratelimit_jiffies. + */ +int __printf_ratelimit(int ratelimit_jiffies, int ratelimit_burst) +{ + static DEFINE_SPINLOCK(ratelimit_lock); + static unsigned long toks = 10 * 5 * HZ; + static unsigned long last_msg; + static int missed; + unsigned long flags; + unsigned long now = jiffies; + + spin_lock_irqsave(&ratelimit_lock, flags); + toks += now - last_msg; + last_msg = now; + if (toks > (ratelimit_burst * ratelimit_jiffies)) + toks = ratelimit_burst * ratelimit_jiffies; + if (toks >= ratelimit_jiffies) { + int lost = missed; + + missed = 0; + toks -= ratelimit_jiffies; + spin_unlock_irqrestore(&ratelimit_lock, flags); + if (lost) + printk("printk: %d messages suppressed.\n", lost); + return 1; + } + missed++; + spin_unlock_irqrestore(&ratelimit_lock, flags); + return 0; +} + +/* minimum time in jiffies between messages */ +int printf_ratelimit_jiffies = 5 * HZ; + +/* number of messages we send before ratelimiting */ +int printf_ratelimit_burst = 10; + +int printf_ratelimit(void) +{ + return __printf_ratelimit(printf_ratelimit_jiffies, + printf_ratelimit_burst); +} /* * ************************************************************** Index: xen/include/xen/lib.h =================================================================== --- xen.orig/include/xen/lib.h +++ xen/include/xen/lib.h @@ -52,8 +52,11 @@ extern void debugtrace_printk(const char /* Allows us to use '%p' as general-purpose machine-word format char. */ #define _p(_x) ((void *)(unsigned long)(_x)) #define printk(_f , _a...) printf( _f , ## _a ) +#define printk_ratelimit() printf_ratelimit() extern void printf(const char *format, ...) __attribute__ ((format (printf, 1, 2))); +extern int __printf_ratelimit(int ratelimit_jiffies, int ratelimit_burst); +extern int printf_ratelimit(void); extern void panic(const char *format, ...) __attribute__ ((format (printf, 1, 2))); extern long vm_assist(struct domain *, unsigned int, unsigned int);
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