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From: David Marchand <david.marchand@redhat.com>
To: dev@dpdk.org
Cc: thomas@monjalon.net, frode.nordahl@canonical.com,
	mattias.ronnblom@ericsson.com, anatoly.burakov@intel.com,
	stable@dpdk.org, "Bruce Richardson" <bruce.richardson@intel.com>,
	"Konstantin Ananyev" <konstantin.v.ananyev@yandex.ru>,
	"Chengwen Feng" <fengchengwen@huawei.com>,
	"Stephen Hemminger" <stephen@networkplumber.org>,
	"Morten Brørup" <mb@smartsharesystems.com>
Subject: [PATCH v2 5/5] eal/x86: defer power intrinsics variable allocation
Date: Tue, 17 Dec 2024 09:59:52 +0100	[thread overview]
Message-ID: <20241217085954.3310414-6-david.marchand@redhat.com> (raw)
In-Reply-To: <20241217085954.3310414-1-david.marchand@redhat.com>

The lcore variable in this code unit is only used through
rte_power_monitor*() public symbols.

Defer the unconditional lcore variable allocation in those symbols.

Fixes: 18b5049ab4fe ("eal/x86: keep power intrinsics state in lcore variable")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
Changes since v1:
- added an initialiser helper,

---
 lib/eal/x86/rte_power_intrinsics.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/eal/x86/rte_power_intrinsics.c b/lib/eal/x86/rte_power_intrinsics.c
index e4cb913590..f7d558153e 100644
--- a/lib/eal/x86/rte_power_intrinsics.c
+++ b/lib/eal/x86/rte_power_intrinsics.c
@@ -22,7 +22,13 @@ struct power_wait_status {
 
 RTE_LCORE_VAR_HANDLE(struct power_wait_status, wait_status);
 
-RTE_LCORE_VAR_INIT(wait_status);
+static void
+init_wait_status(void)
+{
+	if (wait_status != NULL)
+		return;
+	RTE_LCORE_VAR_ALLOC(wait_status);
+}
 
 /*
  * This function uses UMONITOR/UMWAIT instructions and will enter C0.2 state.
@@ -177,6 +183,7 @@ rte_power_monitor(const struct rte_power_monitor_cond *pmc,
 	if (pmc->fn == NULL)
 		return -EINVAL;
 
+	init_wait_status();
 	s = RTE_LCORE_VAR_LCORE(lcore_id, wait_status);
 
 	/* update sleep address */
@@ -269,6 +276,7 @@ rte_power_monitor_wakeup(const unsigned int lcore_id)
 	if (lcore_id >= RTE_MAX_LCORE)
 		return -EINVAL;
 
+	init_wait_status();
 	s = RTE_LCORE_VAR_LCORE(lcore_id, wait_status);
 
 	/*
@@ -308,7 +316,7 @@ int
 rte_power_monitor_multi(const struct rte_power_monitor_cond pmc[],
 		const uint32_t num, const uint64_t tsc_timestamp)
 {
-	struct power_wait_status *s = RTE_LCORE_VAR(wait_status);
+	struct power_wait_status *s;
 	uint32_t i, rc;
 
 	/* check if supported */
@@ -318,6 +326,9 @@ rte_power_monitor_multi(const struct rte_power_monitor_cond pmc[],
 	if (pmc == NULL || num == 0)
 		return -EINVAL;
 
+	init_wait_status();
+	s = RTE_LCORE_VAR(wait_status);
+
 	/* we are already inside transaction region, return */
 	if (rte_xtest() != 0)
 		return 0;
-- 
2.47.0


  parent reply	other threads:[~2024-12-17  9:00 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-12-05 17:57 [PATCH 0/3] Defer lcore variables allocation David Marchand
2024-12-05 17:57 ` [PATCH 1/3] random: defer seeding to EAL init David Marchand
2024-12-06 11:09   ` Mattias Rönnblom
2024-12-16  9:38   ` Burakov, Anatoly
2024-12-05 17:57 ` [PATCH 2/3] power: defer lcore variable allocation David Marchand
2024-12-06 11:29   ` Mattias Rönnblom
2024-12-12  7:57     ` David Marchand
2024-12-13  6:58       ` Mattias Rönnblom
2024-12-16 10:02         ` David Marchand
2024-12-05 17:57 ` [PATCH 3/3] eal/x86: defer power intrinsics " David Marchand
2024-12-06 11:32   ` Mattias Rönnblom
2024-12-06 11:01 ` [PATCH 0/3] Defer lcore variables allocation Mattias Rönnblom
2024-12-06 15:55   ` Thomas Monjalon
2024-12-10 17:09     ` Stephen Hemminger
2024-12-09 11:03   ` David Marchand
2024-12-09 15:39     ` Mattias Rönnblom
2024-12-09 17:40       ` David Marchand
2024-12-10  9:41         ` Mattias Rönnblom
2024-12-16 10:01           ` Burakov, Anatoly
2024-12-16  9:42 ` Burakov, Anatoly
2024-12-16  9:49   ` David Marchand
2024-12-17  9:06     ` David Marchand
2024-12-18 20:10     ` Mattias Rönnblom
2024-12-17  8:59 ` [PATCH v2 0/5] " David Marchand
2024-12-17  8:59   ` [PATCH v2 1/5] eal: check lcore variable handle David Marchand
2024-12-18 11:18     ` Burakov, Anatoly
2024-12-17  8:59   ` [PATCH v2 2/5] random: defer seeding to EAL init David Marchand
2024-12-18 16:35     ` Stephen Hemminger
2024-12-18 17:03       ` Mattias Rönnblom
2024-12-17  8:59   ` [PATCH v2 3/5] power: defer lcore variable allocation David Marchand
2024-12-18 11:17     ` Burakov, Anatoly
2024-12-17  8:59   ` [PATCH v2 4/5] power: reduce memory footprint of per-lcore state David Marchand
2024-12-18 11:17     ` Burakov, Anatoly
2024-12-17  8:59   ` David Marchand [this message]
2024-12-18 11:17     ` [PATCH v2 5/5] eal/x86: defer power intrinsics variable allocation Burakov, Anatoly

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