From patchwork Tue Oct 27 23:07:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 11862241 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F2EA061C for ; Tue, 27 Oct 2020 23:07:20 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 87542221F7 for ; Tue, 27 Oct 2020 23:07:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="DG0QgiOY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 87542221F7 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0E3676B0062; Tue, 27 Oct 2020 19:07:19 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 043A16B0068; Tue, 27 Oct 2020 19:07:18 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E744A6B006C; Tue, 27 Oct 2020 19:07:18 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0103.hostedemail.com [216.40.44.103]) by kanga.kvack.org (Postfix) with ESMTP id B37846B0062 for ; Tue, 27 Oct 2020 19:07:18 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 526B5824999B for ; Tue, 27 Oct 2020 23:07:18 +0000 (UTC) X-FDA: 77419243356.24.move70_110d33a27280 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 3546D1A4A0 for ; Tue, 27 Oct 2020 23:07:18 +0000 (UTC) X-Spam-Summary: 1,0,0,ffe602071059ca74,d41d8cd98f00b204,3jkiyxw0kcnk5s9gm5nhpnn9ibjjbg9.7jhgdips-hhfq57f.jmb@flex--axelrasmussen.bounces.google.com,,RULES_HIT:4:41:152:355:379:541:800:960:966:973:988:989:1260:1277:1313:1314:1345:1359:1431:1434:1437:1516:1518:1593:1594:1605:1730:1747:1777:1792:1801:2196:2199:2393:2559:2562:2892:2897:3138:3139:3140:3141:3142:3152:3865:3866:3867:3868:3870:3871:3872:4250:4321:4385:4605:5007:6119:6261:6653:6737:7903:8603:9149:9969:10004:10946:11026:11473:11658:11914:12043:12048:12291:12296:12297:12438:12555:12683:12895:12986:13137:13150:13161:13229:13230:13231:14096:14097:14394:14659:21080:21222:21433:21444:21451:21627:21740:21966:21987:21990:30012:30029:30030:30054:30075,0,RBL:209.85.219.201:@flex--axelrasmussen.bounces.google.com:.lbl8.mailshell.net-66.100.201.100 62.18.0.100;04y8w8mgm3uuc7fj86begq3yf7fumopossxgam4n619shutwdbzoyixgpz7jy88.fqjtfhnggsptf1is6cuny75tibmptxfncj5fheo8km3xp1grjujx3ei4jzwzkh8.a-lbl8.mailshell.net-223.238.255.100,CacheIP :none,Ba X-HE-Tag: move70_110d33a27280 X-Filterd-Recvd-Size: 18755 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Tue, 27 Oct 2020 23:07:17 +0000 (UTC) Received: by mail-yb1-f201.google.com with SMTP id h6so3164968ybk.4 for ; Tue, 27 Oct 2020 16:07:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=PXKMcdK6dyHqLbiUDGjL0NhOTLu3oLOnHfjhdZgoTQY=; b=DG0QgiOYH9nQby+tzcTnukhTg1xYDRhb9LO7JJFbq4zmh0VmuMCtoPHfMhZ96LkkR4 LZby3s2KTLpwoFGJKftMz57/qzhM6USaLJdVEu1+C/rUJM5MtiyPiMLLjG36fr6imIDB PQEeXur7G2PriHorSceH/kyxm1cPnZ7x0GPRjR+UD6VH/l9UyESUUiRdSfp5eLWEkQPQ AbZ+gVNByuBGjvxEDysywRz/si5Hzy34vF0m9GOzfSokY+i4FcZYRFunjMdaUbgds/W9 nVUf/4lTDp/VPYeDlKH9tJfsoZllBhAd4XpVhu2L7ruyU7bCvlfNwAYF4chTitdK+PPF fZdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=PXKMcdK6dyHqLbiUDGjL0NhOTLu3oLOnHfjhdZgoTQY=; b=Nkp2Azm5tNUVyGVoDn82Btz27zvnHdSftinO8cKPa1W53YgVB0YKZDmwKUDT/bEfyA kEcY6NCHbkEriumIbRjiaUpabhglu3mThLd0Td0xdEDk7YBcGQim0nZugzA6geS2el/u t0xd2+tH5hX4mFXxokA1TnDLmJZ+IH6vjqjh75nJKbHpMWR1zaTkrIVmOtTnBsKNEJkw jm7mbsLdB4hexcNAuy3tJc3Z3BhrI5zAlXXdHYa3YqXKC02z9V7ac06HV/c8p3RiIrEY +pzR0wK7uQvG8bXXWRZc/AGdaQKTn6chl9/Uw4SzIO+ZifjlKdSarb2++y2YY2YFoEcm C3Cw== X-Gm-Message-State: AOAM5327y45/v+B2N41Rq9qX5slQm2/caH5wi1YxYa4Lxxmi2qwk7IKM DZwPSo86t3E+TWP6BCCU1xb0Bi3gGsMNrdB2MHcm X-Google-Smtp-Source: ABdhPJzmSHYdZxLED8JPrsMNL8Q7ukf7eyOjas/Y/qFlDMKxtGZDsl628Mq1gwivZvdeqWAxD++GUWDSgPwvry9FRFht X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:f693:9fff:feef:c8f8]) (user=axelrasmussen job=sendgmr) by 2002:a25:ea42:: with SMTP id o2mr7226537ybe.269.1603840036909; Tue, 27 Oct 2020 16:07:16 -0700 (PDT) Date: Tue, 27 Oct 2020 16:07:11 -0700 In-Reply-To: <20201027230711.2180435-1-axelrasmussen@google.com> Message-Id: <20201027230711.2180435-2-axelrasmussen@google.com> Mime-Version: 1.0 References: <20201027230711.2180435-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.29.0.rc2.309.g374f81d7ae-goog Subject: [PATCH v5 1/1] mmap_lock: add tracepoints around lock acquisition From: Axel Rasmussen To: Steven Rostedt , Ingo Molnar , Andrew Morton , Michel Lespinasse , Vlastimil Babka , Daniel Jordan , Jann Horn , Chinwen Chang , Davidlohr Bueso , David Rientjes , Laurent Dufour Cc: Yafang Shao , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Axel Rasmussen X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The goal of these tracepoints is to be able to debug lock contention issues. This lock is acquired on most (all?) mmap / munmap / page fault operations, so a multi-threaded process which does a lot of these can experience significant contention. We trace just before we start acquisition, when the acquisition returns (whether it succeeded or not), and when the lock is released (or downgraded). The events are broken out by lock type (read / write). The events are also broken out by memcg path. For container-based workloads, users often think of several processes in a memcg as a single logical "task", so collecting statistics at this level is useful. The end goal is to get latency information. This isn't directly included in the trace events. Instead, users are expected to compute the time between "start locking" and "acquire returned", using e.g. synthetic events or BPF. The benefit we get from this is simpler code. Because we use tracepoint_enabled() to decide whether or not to trace, this patch has effectively no overhead unless tracepoints are enabled at runtime. If tracepoints are enabled, there is a performance impact, but how much depends on exactly what e.g. the BPF program does. [ rostedt@goodmis.org: in-depth examples of tracepoint_enabled() usage, and per-cpu-per-context buffer design ] Signed-off-by: Axel Rasmussen Acked-by: Vlastimil Babka --- include/linux/mmap_lock.h | 95 +++++++++++++++- include/trace/events/mmap_lock.h | 107 ++++++++++++++++++ mm/Makefile | 2 +- mm/mmap_lock.c | 187 +++++++++++++++++++++++++++++++ 4 files changed, 385 insertions(+), 6 deletions(-) create mode 100644 include/trace/events/mmap_lock.h create mode 100644 mm/mmap_lock.c diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h index e1afb420fc94..3d13f998477e 100644 --- a/include/linux/mmap_lock.h +++ b/include/linux/mmap_lock.h @@ -1,11 +1,65 @@ #ifndef _LINUX_MMAP_LOCK_H #define _LINUX_MMAP_LOCK_H +#include +#include #include +#include +#include +#include #define MMAP_LOCK_INITIALIZER(name) \ .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock), +DECLARE_TRACEPOINT(mmap_lock_start_locking); +DECLARE_TRACEPOINT(mmap_lock_acquire_returned); +DECLARE_TRACEPOINT(mmap_lock_released); + +#ifdef CONFIG_TRACING + +void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write); +void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write, + bool success); +void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write); + +static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm, + bool write) +{ + if (tracepoint_enabled(mmap_lock_start_locking)) + __mmap_lock_do_trace_start_locking(mm, write); +} + +static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm, + bool write, bool success) +{ + if (tracepoint_enabled(mmap_lock_acquire_returned)) + __mmap_lock_do_trace_acquire_returned(mm, write, success); +} + +static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write) +{ + if (tracepoint_enabled(mmap_lock_released)) + __mmap_lock_do_trace_released(mm, write); +} + +#else /* !CONFIG_TRACING */ + +static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm, + bool write) +{ +} + +static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm, + bool write, bool success) +{ +} + +static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write) +{ +} + +#endif /* CONFIG_TRACING */ + static inline void mmap_init_lock(struct mm_struct *mm) { init_rwsem(&mm->mmap_lock); @@ -13,58 +67,88 @@ static inline void mmap_init_lock(struct mm_struct *mm) static inline void mmap_write_lock(struct mm_struct *mm) { + __mmap_lock_trace_start_locking(mm, true); down_write(&mm->mmap_lock); + __mmap_lock_trace_acquire_returned(mm, true, true); } static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass) { + __mmap_lock_trace_start_locking(mm, true); down_write_nested(&mm->mmap_lock, subclass); + __mmap_lock_trace_acquire_returned(mm, true, true); } static inline int mmap_write_lock_killable(struct mm_struct *mm) { - return down_write_killable(&mm->mmap_lock); + int ret; + + __mmap_lock_trace_start_locking(mm, true); + ret = down_write_killable(&mm->mmap_lock); + __mmap_lock_trace_acquire_returned(mm, true, ret == 0); + return ret; } static inline bool mmap_write_trylock(struct mm_struct *mm) { - return down_write_trylock(&mm->mmap_lock) != 0; + bool ret; + + __mmap_lock_trace_start_locking(mm, true); + ret = down_write_trylock(&mm->mmap_lock) != 0; + __mmap_lock_trace_acquire_returned(mm, true, ret); + return ret; } static inline void mmap_write_unlock(struct mm_struct *mm) { up_write(&mm->mmap_lock); + __mmap_lock_trace_released(mm, true); } static inline void mmap_write_downgrade(struct mm_struct *mm) { downgrade_write(&mm->mmap_lock); + __mmap_lock_trace_acquire_returned(mm, false, true); } static inline void mmap_read_lock(struct mm_struct *mm) { + __mmap_lock_trace_start_locking(mm, false); down_read(&mm->mmap_lock); + __mmap_lock_trace_acquire_returned(mm, false, true); } static inline int mmap_read_lock_killable(struct mm_struct *mm) { - return down_read_killable(&mm->mmap_lock); + int ret; + + __mmap_lock_trace_start_locking(mm, false); + ret = down_read_killable(&mm->mmap_lock); + __mmap_lock_trace_acquire_returned(mm, false, ret == 0); + return ret; } static inline bool mmap_read_trylock(struct mm_struct *mm) { - return down_read_trylock(&mm->mmap_lock) != 0; + bool ret; + + __mmap_lock_trace_start_locking(mm, false); + ret = down_read_trylock(&mm->mmap_lock) != 0; + __mmap_lock_trace_acquire_returned(mm, false, ret); + return ret; } static inline void mmap_read_unlock(struct mm_struct *mm) { up_read(&mm->mmap_lock); + __mmap_lock_trace_released(mm, false); } static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm) { - if (down_read_trylock(&mm->mmap_lock)) { + if (mmap_read_trylock(mm)) { rwsem_release(&mm->mmap_lock.dep_map, _RET_IP_); + __mmap_lock_trace_released(mm, false); return true; } return false; @@ -73,6 +157,7 @@ static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm) static inline void mmap_read_unlock_non_owner(struct mm_struct *mm) { up_read_non_owner(&mm->mmap_lock); + __mmap_lock_trace_released(mm, false); } static inline void mmap_assert_locked(struct mm_struct *mm) diff --git a/include/trace/events/mmap_lock.h b/include/trace/events/mmap_lock.h new file mode 100644 index 000000000000..0abff67b96f0 --- /dev/null +++ b/include/trace/events/mmap_lock.h @@ -0,0 +1,107 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM mmap_lock + +#if !defined(_TRACE_MMAP_LOCK_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_MMAP_LOCK_H + +#include +#include + +struct mm_struct; + +extern int trace_mmap_lock_reg(void); +extern void trace_mmap_lock_unreg(void); + +TRACE_EVENT_FN(mmap_lock_start_locking, + + TP_PROTO(struct mm_struct *mm, const char *memcg_path, bool write), + + TP_ARGS(mm, memcg_path, write), + + TP_STRUCT__entry( + __field(struct mm_struct *, mm) + __string(memcg_path, memcg_path) + __field(bool, write) + ), + + TP_fast_assign( + __entry->mm = mm; + __assign_str(memcg_path, memcg_path); + __entry->write = write; + ), + + TP_printk( + "mm=%p memcg_path=%s write=%s\n", + __entry->mm, + __get_str(memcg_path), + __entry->write ? "true" : "false" + ), + + trace_mmap_lock_reg, trace_mmap_lock_unreg +); + +TRACE_EVENT_FN(mmap_lock_acquire_returned, + + TP_PROTO(struct mm_struct *mm, const char *memcg_path, bool write, + bool success), + + TP_ARGS(mm, memcg_path, write, success), + + TP_STRUCT__entry( + __field(struct mm_struct *, mm) + __string(memcg_path, memcg_path) + __field(bool, write) + __field(bool, success) + ), + + TP_fast_assign( + __entry->mm = mm; + __assign_str(memcg_path, memcg_path); + __entry->write = write; + __entry->success = success; + ), + + TP_printk( + "mm=%p memcg_path=%s write=%s success=%s\n", + __entry->mm, + __get_str(memcg_path), + __entry->write ? "true" : "false", + __entry->success ? "true" : "false" + ), + + trace_mmap_lock_reg, trace_mmap_lock_unreg +); + +TRACE_EVENT_FN(mmap_lock_released, + + TP_PROTO(struct mm_struct *mm, const char *memcg_path, bool write), + + TP_ARGS(mm, memcg_path, write), + + TP_STRUCT__entry( + __field(struct mm_struct *, mm) + __string(memcg_path, memcg_path) + __field(bool, write) + ), + + TP_fast_assign( + __entry->mm = mm; + __assign_str(memcg_path, memcg_path); + __entry->write = write; + ), + + TP_printk( + "mm=%p memcg_path=%s write=%s\n", + __entry->mm, + __get_str(memcg_path), + __entry->write ? "true" : "false" + ), + + trace_mmap_lock_reg, trace_mmap_lock_unreg +); + +#endif /* _TRACE_MMAP_LOCK_H */ + +/* This part must be outside protection */ +#include diff --git a/mm/Makefile b/mm/Makefile index 069f216e109e..b6cd2fffa492 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -52,7 +52,7 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ mm_init.o percpu.o slab_common.o \ compaction.o vmacache.o \ interval_tree.o list_lru.o workingset.o \ - debug.o gup.o $(mmu-y) + debug.o gup.o mmap_lock.o $(mmu-y) # Give 'page_alloc' its own module-parameter namespace page-alloc-y := page_alloc.o diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c new file mode 100644 index 000000000000..12af8f1b8a14 --- /dev/null +++ b/mm/mmap_lock.c @@ -0,0 +1,187 @@ +// SPDX-License-Identifier: GPL-2.0 +#define CREATE_TRACE_POINTS +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +EXPORT_TRACEPOINT_SYMBOL(mmap_lock_start_locking); +EXPORT_TRACEPOINT_SYMBOL(mmap_lock_acquire_returned); +EXPORT_TRACEPOINT_SYMBOL(mmap_lock_released); + +#ifdef CONFIG_MEMCG + +/* + * Our various events all share the same buffer (because we don't want or need + * to allocate a set of buffers *per event type*), so we need to protect against + * concurrent _reg() and _unreg() calls, and count how many _reg() calls have + * been made. + */ +static DEFINE_SPINLOCK(reg_lock); +static int reg_refcount; + +/* + * Size of the buffer for memcg path names. Ignoring stack trace support, + * trace_events_hist.c uses MAX_FILTER_STR_VAL for this, so we also use it. + */ +#define MEMCG_PATH_BUF_SIZE MAX_FILTER_STR_VAL + +/* + * How many contexts our trace events might be called in: normal, softirq, irq, + * and NMI. + */ +#define CONTEXT_COUNT 4 + +DEFINE_PER_CPU(char *, memcg_path_buf); +DEFINE_PER_CPU(int, memcg_path_buf_idx); + +int trace_mmap_lock_reg(void) +{ + unsigned long flags; + int cpu; + + spin_lock_irqsave(®_lock, flags); + + if (reg_refcount++) + goto out; + + for_each_possible_cpu(cpu) { + per_cpu(memcg_path_buf, cpu) = NULL; + } + for_each_possible_cpu(cpu) { + per_cpu(memcg_path_buf, cpu) = kmalloc( + MEMCG_PATH_BUF_SIZE * CONTEXT_COUNT, GFP_NOWAIT); + if (per_cpu(memcg_path_buf, cpu) == NULL) + goto out_fail; + per_cpu(memcg_path_buf_idx, cpu) = 0; + } + +out: + spin_unlock_irqrestore(®_lock, flags); + return 0; + +out_fail: + for_each_possible_cpu(cpu) { + if (per_cpu(memcg_path_buf, cpu) != NULL) + kfree(per_cpu(memcg_path_buf, cpu)); + else + break; + } + + --reg_refcount; + + spin_unlock_irqrestore(®_lock, flags); + return -ENOMEM; +} + +void trace_mmap_lock_unreg(void) +{ + unsigned long flags; + int cpu; + + spin_lock_irqsave(®_lock, flags); + + if (--reg_refcount) + goto out; + + for_each_possible_cpu(cpu) { + kfree(per_cpu(memcg_path_buf, cpu)); + } + +out: + spin_unlock_irqrestore(®_lock, flags); +} + +static inline char *get_memcg_path_buf(void) +{ + int idx; + + idx = this_cpu_add_return(memcg_path_buf_idx, MEMCG_PATH_BUF_SIZE) - + MEMCG_PATH_BUF_SIZE; + return &this_cpu_read(memcg_path_buf)[idx]; +} + +static inline void put_memcg_path_buf(void) +{ + this_cpu_sub(memcg_path_buf_idx, MEMCG_PATH_BUF_SIZE); +} + +/* + * Write the given mm_struct's memcg path to a percpu buffer, and return a + * pointer to it. If the path cannot be determined, NULL is returned. + * + * Note: buffers are allocated per-cpu to avoid locking, so preemption must be + * disabled by the caller before calling us, and re-enabled only after the + * caller is done with the pointer. + */ +static const char *get_mm_memcg_path(struct mm_struct *mm) +{ + struct mem_cgroup *memcg = get_mem_cgroup_from_mm(mm); + + if (memcg != NULL && likely(memcg->css.cgroup != NULL)) { + char *buf = get_memcg_path_buf(); + + cgroup_path(memcg->css.cgroup, buf, MEMCG_PATH_BUF_SIZE); + return buf; + } + return NULL; +} + +#define TRACE_MMAP_LOCK_EVENT(type, mm, ...) \ + do { \ + const char *memcg_path; \ + preempt_disable(); \ + memcg_path = get_mm_memcg_path(mm); \ + trace_mmap_lock_##type(mm, \ + memcg_path != NULL ? memcg_path : "", \ + ##__VA_ARGS__); \ + if (likely(memcg_path != NULL)) \ + put_memcg_path_buf(); \ + preempt_enable(); \ + } while (0) + +#else /* !CONFIG_MEMCG */ + +int trace_mmap_lock_reg(void) +{ + return 0; +} + +void trace_mmap_lock_unreg(void) +{ +} + +#define TRACE_MMAP_LOCK_EVENT(type, mm, ...) \ + trace_mmap_lock_##type(mm, "", ##__VA_ARGS__) + +#endif /* CONFIG_MEMCG */ + +/* + * Trace calls must be in a separate file, as otherwise there's a circular + * dependency between linux/mmap_lock.h and trace/events/mmap_lock.h. + */ + +void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write) +{ + TRACE_MMAP_LOCK_EVENT(start_locking, mm, write); +} +EXPORT_SYMBOL(__mmap_lock_do_trace_start_locking); + +void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write, + bool success) +{ + TRACE_MMAP_LOCK_EVENT(acquire_returned, mm, write, success); +} +EXPORT_SYMBOL(__mmap_lock_do_trace_acquire_returned); + +void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write) +{ + TRACE_MMAP_LOCK_EVENT(released, mm, write); +} +EXPORT_SYMBOL(__mmap_lock_do_trace_released);