From: Vivek Kumar <quic_vivekuma@quicinc.com> To: <corbet@lwn.net>, <catalin.marinas@arm.com>, <will@kernel.org>, <tglx@linutronix.de>, <maz@kernel.org>, <axboe@kernel.dk>, <rafael@kernel.org>, <akpm@linux-foundation.org>, <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-block@vger.kernel.org>, <linux-pm@vger.kernel.org>, <linux-mm@kvack.org> Cc: <len.brown@intel.com>, <pavel@ucw.cz>, <paulmck@kernel.org>, <bp@suse.de>, <keescook@chromium.org>, <songmuchun@bytedance.com>, <rdunlap@infradead.org>, <damien.lemoal@opensource.wdc.com>, <pasha.tatashin@soleen.com>, <tabba@google.com>, <ardb@kernel.org>, <tsoni@quicinc.com>, <quic_psodagud@quicinc.com>, <quic_svaddagi@quicinc.com>, Vivek Kumar <quic_vivekuma@quicinc.com>, Prasanna Kumar <quic_kprasan@quicinc.com> Subject: [RFC 2/6] PM: Hibernate: Add option to disable disk offset randomization Date: Wed, 18 May 2022 13:18:37 +0530 [thread overview] Message-ID: <1652860121-24092-3-git-send-email-quic_vivekuma@quicinc.com> (raw) In-Reply-To: <1652860121-24092-1-git-send-email-quic_vivekuma@quicinc.com> Add a kernel parameter to disable the disk offset randomization for SSD devices in which such feature is available at the firmware level. This is helpful in improving hibernation resume time. Signed-off-by: Vivek Kumar <quic_vivekuma@quicinc.com> Signed-off-by: Prasanna Kumar <quic_kprasan@quicinc.com> --- Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++ kernel/power/swap.c | 9 +++++++++ 2 files changed, 20 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 666ade9..06b4f10 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5192,6 +5192,17 @@ Useful for devices that are detected asynchronously (e.g. USB and MMC devices). + noswap_randomize + Kernel uses random disk offsets to help with wear-levelling + of SSD devices, while saving the hibernation snapshot image to + disk. Use this parameter to disable this feature for SSD + devices in scenarios when, such randomization is addressed at + the firmware level and hibenration image is not re-generated + frequently. + (Useful for improving hibernation resume time as snapshot pages + are available in disk serially and can be read in bigger chunks + without seeking) + retain_initrd [RAM] Keep initrd memory after extraction rfkill.default_state= diff --git a/kernel/power/swap.c b/kernel/power/swap.c index 91fffdd..8d5c811 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -44,6 +44,7 @@ u32 swsusp_hardware_signature; */ static bool clean_pages_on_read; static bool clean_pages_on_decompress; +static bool noswap_randomize; /* * The swap map is a data structure used for keeping track of each page @@ -1616,3 +1617,11 @@ static int __init swsusp_header_init(void) } core_initcall(swsusp_header_init); + +static int __init noswap_randomize_setup(char *str) +{ + noswap_randomize = true; + return 1; +} + +__setup("noswap_randomize", noswap_randomize_setup); -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Vivek Kumar <quic_vivekuma@quicinc.com> To: <corbet@lwn.net>, <catalin.marinas@arm.com>, <will@kernel.org>, <tglx@linutronix.de>, <maz@kernel.org>, <axboe@kernel.dk>, <rafael@kernel.org>, <akpm@linux-foundation.org>, <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-block@vger.kernel.org>, <linux-pm@vger.kernel.org>, <linux-mm@kvack.org> Cc: <len.brown@intel.com>, <pavel@ucw.cz>, <paulmck@kernel.org>, <bp@suse.de>, <keescook@chromium.org>, <songmuchun@bytedance.com>, <rdunlap@infradead.org>, <damien.lemoal@opensource.wdc.com>, <pasha.tatashin@soleen.com>, <tabba@google.com>, <ardb@kernel.org>, <tsoni@quicinc.com>, <quic_psodagud@quicinc.com>, <quic_svaddagi@quicinc.com>, Vivek Kumar <quic_vivekuma@quicinc.com>, Prasanna Kumar <quic_kprasan@quicinc.com> Subject: [RFC 2/6] PM: Hibernate: Add option to disable disk offset randomization Date: Wed, 18 May 2022 13:18:37 +0530 [thread overview] Message-ID: <1652860121-24092-3-git-send-email-quic_vivekuma@quicinc.com> (raw) In-Reply-To: <1652860121-24092-1-git-send-email-quic_vivekuma@quicinc.com> Add a kernel parameter to disable the disk offset randomization for SSD devices in which such feature is available at the firmware level. This is helpful in improving hibernation resume time. Signed-off-by: Vivek Kumar <quic_vivekuma@quicinc.com> Signed-off-by: Prasanna Kumar <quic_kprasan@quicinc.com> --- Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++ kernel/power/swap.c | 9 +++++++++ 2 files changed, 20 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 666ade9..06b4f10 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5192,6 +5192,17 @@ Useful for devices that are detected asynchronously (e.g. USB and MMC devices). + noswap_randomize + Kernel uses random disk offsets to help with wear-levelling + of SSD devices, while saving the hibernation snapshot image to + disk. Use this parameter to disable this feature for SSD + devices in scenarios when, such randomization is addressed at + the firmware level and hibenration image is not re-generated + frequently. + (Useful for improving hibernation resume time as snapshot pages + are available in disk serially and can be read in bigger chunks + without seeking) + retain_initrd [RAM] Keep initrd memory after extraction rfkill.default_state= diff --git a/kernel/power/swap.c b/kernel/power/swap.c index 91fffdd..8d5c811 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -44,6 +44,7 @@ u32 swsusp_hardware_signature; */ static bool clean_pages_on_read; static bool clean_pages_on_decompress; +static bool noswap_randomize; /* * The swap map is a data structure used for keeping track of each page @@ -1616,3 +1617,11 @@ static int __init swsusp_header_init(void) } core_initcall(swsusp_header_init); + +static int __init noswap_randomize_setup(char *str) +{ + noswap_randomize = true; + return 1; +} + +__setup("noswap_randomize", noswap_randomize_setup); -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-18 7:49 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-18 7:48 [RFC 0/6] Bootloader based hibernation Vivek Kumar 2022-05-18 7:48 ` Vivek Kumar 2022-05-18 7:48 ` [RFC 1/6] arm64: hibernate: Introduce new entry point to kernel Vivek Kumar 2022-05-18 7:48 ` Vivek Kumar 2022-05-19 15:27 ` Marc Zyngier 2022-05-19 15:27 ` Marc Zyngier 2022-05-18 7:48 ` Vivek Kumar [this message] 2022-05-18 7:48 ` [RFC 2/6] PM: Hibernate: Add option to disable disk offset randomization Vivek Kumar 2022-05-18 12:19 ` Andrew Lunn 2022-05-18 12:19 ` Andrew Lunn 2022-05-18 13:00 ` Christoph Hellwig 2022-05-18 13:00 ` Christoph Hellwig 2022-05-23 20:49 ` Randy Dunlap 2022-05-23 20:49 ` Randy Dunlap 2022-05-18 7:48 ` [RFC 3/6] block: gendisk: Add a new genhd capability flag Vivek Kumar 2022-05-18 7:48 ` Vivek Kumar 2022-05-18 8:08 ` Christoph Hellwig 2022-05-18 8:08 ` Christoph Hellwig 2022-05-18 7:48 ` [RFC 4/6] mm: swap: Add randomization check for swapon/off calls Vivek Kumar 2022-05-18 7:48 ` Vivek Kumar 2022-05-18 12:27 ` Andrew Lunn 2022-05-18 12:27 ` Andrew Lunn 2022-05-18 7:48 ` [RFC 5/6] Hibernate: Add check for pte_valid in saveable page Vivek Kumar 2022-05-18 7:48 ` Vivek Kumar 2022-05-18 13:09 ` Christoph Hellwig 2022-05-18 13:09 ` Christoph Hellwig 2022-05-18 7:48 ` [RFC 6/6] irqchip/gic-v3: Re-init GIC hardware upon hibernation restore Vivek Kumar 2022-05-18 7:48 ` Vivek Kumar 2022-05-19 7:59 ` Marc Zyngier 2022-05-19 7:59 ` Marc Zyngier 2022-05-18 16:55 ` [RFC 0/6] Bootloader based hibernation Pasha Tatashin 2022-05-18 16:55 ` Pasha Tatashin 2022-05-20 16:43 ` Mark Rutland 2022-05-20 16:43 ` Mark Rutland
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