From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD7031D8DE1 for ; Tue, 18 Mar 2025 05:10:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742274641; cv=none; b=YAPDMuc5L2Pqdv/KJLSnOXPghWCRAZ0OZ2d+JYlpzd1ExlMYJcUwlx9qvfSdvi8cB+IIOZWUochbfJcpMnXChpMzDmyUOJizXGXIpaRB6qatD85WxAXHnOY97yHUs09GafDzfVnfE3Y6SBHEbCA7oL9aKAwBe3EAG6Qh1gdimvY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742274641; c=relaxed/simple; bh=X2ak3kMibzQGdEAHVTjpNPK6D5+e1f7yEnLa3WTa8l8=; h=Date:To:From:Subject:Message-Id; b=JXVKlFtf2wBkV7ljYaid6Kvk/CwK51HlLs7pyiV4MaOkwWhOlr+2SiAu0mQv1KrFVnugMreD8URoKeqrYaTfZapCP4zpye+9A9GA6yp5ZrQndOfbG3Yy8crm6XR751K+zBl1vQDcH7pH/L0T3jMyrAZ23+PZl/2BNFG8axiwuT4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=uyOxlN/p; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="uyOxlN/p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0DF8C4CEDD; Tue, 18 Mar 2025 05:10:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1742274641; bh=X2ak3kMibzQGdEAHVTjpNPK6D5+e1f7yEnLa3WTa8l8=; h=Date:To:From:Subject:From; b=uyOxlN/pMFwShARph2/bWHZO6k4xuayy5Vi4zNjpXcRNOedbTmlbdpkT7qLA1dfvF 6J23MLAX22ZSwTA/VW+La0hjs2U2QrXsQc5tgCxEOsrYyGM23uFSzCLqqHQ7x1qbc7 nNA+TZ4EOP8XcNdolbf+sZE9iJIICf2Dfzmx6qJw= Date: Mon, 17 Mar 2025 22:10:40 -0700 To: mm-commits@vger.kernel.org,rostedt@goodmis.org,rientjes@google.com,mhiramat@kernel.org,mathieu.desnoyers@efficios.com,liumartin@google.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-page_alloc-add-trace-event-for-per-zone-lowmem-reserve-setup.patch removed from -mm tree Message-Id: <20250318051041.A0DF8C4CEDD@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/page_alloc: add trace event for per-zone lowmem reserve setup has been removed from the -mm tree. Its filename was mm-page_alloc-add-trace-event-for-per-zone-lowmem-reserve-setup.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Martin Liu Subject: mm/page_alloc: add trace event for per-zone lowmem reserve setup Date: Sat, 8 Mar 2025 03:46:01 +0000 This commit introduces the `mm_setup_per_zone_lowmem_reserve` trace event,which provides detailed insights into the kernel's per-zone lowmem reserve configuration. The trace event provides precise timestamps, allowing developers to 1. Correlate lowmem reserve changes with specific kernel events and able to diagnose unexpected kswapd or direct reclaim behavior triggered by dynamic changes in lowmem reserve. 2. Know memory allocation failures that occur due to insufficient lowmem reserve, by precisely correlating allocation attempts with reserve adjustments. Link: https://lkml.kernel.org/r/20250308034606.2036033-3-liumartin@google.com Signed-off-by: Martin Liu Acked-by: David Rientjes Cc: "Masami Hiramatsu (Google)" Cc: Mathieu Desnoyers Cc: Steven Rostedt Signed-off-by: Andrew Morton --- include/trace/events/kmem.h | 27 +++++++++++++++++++++++++++ mm/page_alloc.c | 2 ++ 2 files changed, 29 insertions(+) --- a/include/trace/events/kmem.h~mm-page_alloc-add-trace-event-for-per-zone-lowmem-reserve-setup +++ a/include/trace/events/kmem.h @@ -375,6 +375,33 @@ TRACE_EVENT(mm_setup_per_zone_wmarks, __entry->watermark_promo) ); +TRACE_EVENT(mm_setup_per_zone_lowmem_reserve, + + TP_PROTO(struct zone *zone, struct zone *upper_zone, long lowmem_reserve), + + TP_ARGS(zone, upper_zone, lowmem_reserve), + + TP_STRUCT__entry( + __field(int, node_id) + __string(name, zone->name) + __string(upper_name, upper_zone->name) + __field(long, lowmem_reserve) + ), + + TP_fast_assign( + __entry->node_id = zone->zone_pgdat->node_id; + __assign_str(name); + __assign_str(upper_name); + __entry->lowmem_reserve = lowmem_reserve; + ), + + TP_printk("node_id=%d zone name=%s upper_zone name=%s lowmem_reserve_pages=%ld", + __entry->node_id, + __get_str(name), + __get_str(upper_name), + __entry->lowmem_reserve) +); + /* * Required for uniquely and securely identifying mm in rss_stat tracepoint. */ --- a/mm/page_alloc.c~mm-page_alloc-add-trace-event-for-per-zone-lowmem-reserve-setup +++ a/mm/page_alloc.c @@ -5943,6 +5943,8 @@ static void setup_per_zone_lowmem_reserv zone->lowmem_reserve[j] = 0; else zone->lowmem_reserve[j] = managed_pages / ratio; + trace_mm_setup_per_zone_lowmem_reserve(zone, upper_zone, + zone->lowmem_reserve[j]); } } } _ Patches currently in -mm which might be from liumartin@google.com are