/* * Definitions for measuring cputime in nsecs resolution. * * Based on * * Copyright (C) 2007 FUJITSU LIMITED * Copyright (C) 2007 Hidetoshi Seto * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #ifndef _ASM_GENERIC_CPUTIME_NSECS_H #define _ASM_GENERIC_CPUTIME_NSECS_H #include typedef u64 __nocast cputime_t; typedef u64 __nocast cputime64_t; #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new) #define cputime_one_jiffy jiffies_to_cputime(1) #define cputime_div(__ct, divisor) div_u64((__force u64)__ct, divisor) #define cputime_div_rem(__ct, divisor, remainder) \ div_u64_rem((__force u64)__ct, divisor, remainder); /* * Convert cputime <-> jiffies (HZ) */ #define cputime_to_jiffies(__ct) \ cputime_div(__ct, NSEC_PER_SEC / HZ) #define jiffies_to_cputime(__jif) \ (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ)) #define cputime64_to_jiffies64(__ct) \ cputime_div(__ct, NSEC_PER_SEC / HZ) #define jiffies64_to_cputime64(__jif) \ (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ)) /* * Convert cputime <-> nanoseconds */ #define cputime_to_nsecs(__ct) \ (__force u64)(__ct) #define nsecs_to_cputime(__nsecs) \ (__force cputime_t)(__nsecs) #define nsecs_to_cputime64(__nsecs) \ (__force cputime64_t)(__nsecs) /* * Convert cputime <-> microseconds */ #define cputime_to_usecs(__ct) \ cputime_div(__ct, NSEC_PER_USEC) #define usecs_to_cputime(__usecs) \ (__force cputime_t)((__usecs) * NSEC_PER_USEC) #define usecs_to_cputime64(__usecs) \ (__force cputime64_t)((__usecs) * NSEC_PER_USEC) /* * Convert cputime <-> seconds */ #define cputime_to_secs(__ct) \ cputime_div(__ct, NSEC_PER_SEC) #define secs_to_cputime(__secs) \ (__force cputime_t)((__secs) * NSEC_PER_SEC) /* * Convert cputime <-> timespec (nsec) */ static inline cputime_t timespec_to_cputime(const struct timespec *val) { u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec; return (__force cputime_t) ret; } static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val) { u32 rem; val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem); val->tv_nsec = rem; } /* * Convert cputime <-> timeval (msec) */ static inline cputime_t timeval_to_cputime(const struct timeval *val) { u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC; return (__force cputime_t) ret; } static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val) { u32 rem; val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem); val->tv_usec = rem / NSEC_PER_USEC; } /* * Convert cputime <-> clock (USER_HZ) */ #define cputime_to_clock_t(__ct) \ cputime_div(__ct, (NSEC_PER_SEC / USER_HZ)) #define clock_t_to_cputime(__x) \ (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ)) /* * Convert cputime64 to clock. */ #define cputime64_to_clock_t(__ct) \ cputime_to_clock_t((__force cputime_t)__ct) #endif href='/cgit.cgi/linux/net-next.git/commit/tools/perf/arch/powerpc?id=433e19cf33d34bb6751c874a9c00980552fe508c'>powerpc/annotate
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /tools/perf/arch/powerpc/annotate
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/arch/powerpc/annotate')