From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41835) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dHrIF-0000BY-J0 for qemu-devel@nongnu.org; Mon, 05 Jun 2017 08:39:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dHrIE-0006C5-GE for qemu-devel@nongnu.org; Mon, 05 Jun 2017 08:39:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55654) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dHrIE-0006As-7c for qemu-devel@nongnu.org; Mon, 05 Jun 2017 08:39:34 -0400 From: Paolo Bonzini Date: Mon, 5 Jun 2017 14:39:08 +0200 Message-Id: <20170605123908.18777-20-pbonzini@redhat.com> In-Reply-To: <20170605123908.18777-1-pbonzini@redhat.com> References: <20170605123908.18777-1-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 19/19] block: make accounting thread-safe List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: famz@redhat.com, Alberto Garcia I'm not trying too hard yet. Later, with multiqueue support, this may cause mutex contention or cacheline bouncing. Cc: Alberto Garcia Reviewed-by: Stefan Hajnoczi Signed-off-by: Paolo Bonzini --- block/accounting.c | 16 ++++++++++++++++ include/block/accounting.h | 8 ++++++-- 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/block/accounting.c b/block/accounting.c index ce6dbf7760..87ef5bbfaa 100644 --- a/block/accounting.c +++ b/block/accounting.c @@ -34,6 +34,7 @@ static const int qtest_latency_ns = NANOSECONDS_PER_SECOND / 1000; void block_acct_init(BlockAcctStats *stats) { + qemu_mutex_init(&stats->lock); if (qtest_enabled()) { clock_type = QEMU_CLOCK_VIRTUAL; } @@ -52,6 +53,7 @@ void block_acct_cleanup(BlockAcctStats *stats) QSLIST_FOREACH_SAFE(s, &stats->intervals, entries, next) { g_free(s); } + qemu_mutex_destroy(&stats->lock); } void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length) @@ -61,12 +63,15 @@ void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length) s = g_new0(BlockAcctTimedStats, 1); s->interval_length = interval_length; + s->stats = stats; + qemu_mutex_lock(&stats->lock); QSLIST_INSERT_HEAD(&stats->intervals, s, entries); for (i = 0; i < BLOCK_MAX_IOTYPE; i++) { timed_average_init(&s->latency[i], clock_type, (uint64_t) interval_length * NANOSECONDS_PER_SECOND); } + qemu_mutex_unlock(&stats->lock); } BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats, @@ -102,6 +107,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie, assert(cookie->type < BLOCK_MAX_IOTYPE); + qemu_mutex_lock(&stats->lock); + if (failed) { stats->failed_ops[cookie->type]++; } else { @@ -117,6 +124,8 @@ static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie, timed_average_account(&s->latency[cookie->type], latency_ns); } } + + qemu_mutex_unlock(&stats->lock); } void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie) @@ -137,18 +146,23 @@ void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type) * not. The reason is that invalid requests are accounted during their * submission, therefore there's no actual I/O involved. */ + qemu_mutex_lock(&stats->lock); stats->invalid_ops[type]++; if (stats->account_invalid) { stats->last_access_time_ns = qemu_clock_get_ns(clock_type); } + qemu_mutex_unlock(&stats->lock); } void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, int num_requests) { assert(type < BLOCK_MAX_IOTYPE); + + qemu_mutex_lock(&stats->lock); stats->merged[type] += num_requests; + qemu_mutex_unlock(&stats->lock); } int64_t block_acct_idle_time_ns(BlockAcctStats *stats) @@ -163,7 +177,9 @@ double block_acct_queue_depth(BlockAcctTimedStats *stats, assert(type < BLOCK_MAX_IOTYPE); + qemu_mutex_lock(&stats->stats->lock); sum = timed_average_sum(&stats->latency[type], &elapsed); + qemu_mutex_unlock(&stats->stats->lock); return (double) sum / elapsed; } diff --git a/include/block/accounting.h b/include/block/accounting.h index 55cb06fdb6..b833d26d6c 100644 --- a/include/block/accounting.h +++ b/include/block/accounting.h @@ -26,8 +26,10 @@ #define BLOCK_ACCOUNTING_H #include "qemu/timed-average.h" +#include "qemu/thread.h" typedef struct BlockAcctTimedStats BlockAcctTimedStats; +typedef struct BlockAcctStats BlockAcctStats; enum BlockAcctType { BLOCK_ACCT_READ, @@ -37,12 +39,14 @@ enum BlockAcctType { }; struct BlockAcctTimedStats { + BlockAcctStats *stats; TimedAverage latency[BLOCK_MAX_IOTYPE]; unsigned interval_length; /* in seconds */ QSLIST_ENTRY(BlockAcctTimedStats) entries; }; -typedef struct BlockAcctStats { +struct BlockAcctStats { + QemuMutex lock; uint64_t nr_bytes[BLOCK_MAX_IOTYPE]; uint64_t nr_ops[BLOCK_MAX_IOTYPE]; uint64_t invalid_ops[BLOCK_MAX_IOTYPE]; @@ -53,7 +57,7 @@ typedef struct BlockAcctStats { QSLIST_HEAD(, BlockAcctTimedStats) intervals; bool account_invalid; bool account_failed; -} BlockAcctStats; +}; typedef struct BlockAcctCookie { int64_t bytes; -- 2.13.0