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Message-ID: <20240906141520.730009-4-bigeasy@linutronix.de>
Date: Fri, 6 Sep 2024 16:14:45 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
Mike Galbraith <umgwanakikbuti@...il.com>,
Minchan Kim <minchan@...nel.org>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Thomas Gleixner <tglx@...utronix.de>,
Alexander Lobakin <aleksander.lobakin@...el.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH v4 3/3] zram: Shrink zram_table_entry::flags.
The zram_table_entry::flags member is of type long and uses 8 bytes on a
64bit architecture. With a PAGE_SIZE of 256KiB we have PAGE_SHIFT of 18
which in turn leads to __NR_ZRAM_PAGEFLAGS = 27. This still fits in an
ordinary integer.
By reducing the size of `flags' to four bytes, the size of the struct
goes back to 16 bytes. The padding between the lock and ac_time (if
enabled) is also gone.
Make zram_table_entry::flags an unsigned int and update the build test
to reflect the change.
Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
drivers/block/zram/zram_drv.c | 3 ++-
drivers/block/zram/zram_drv.h | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 812d4e7a6b7f0..f8206ba6cbbba 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -2532,9 +2532,10 @@ static void destroy_devices(void)
static int __init zram_init(void)
{
+ struct zram_table_entry zram_te;
int ret;
- BUILD_BUG_ON(__NR_ZRAM_PAGEFLAGS > BITS_PER_LONG);
+ BUILD_BUG_ON(__NR_ZRAM_PAGEFLAGS > sizeof(zram_te.flags) * 8);
ret = cpuhp_setup_state_multi(CPUHP_ZCOMP_PREPARE, "block/zram:prepare",
zcomp_cpu_up_prepare, zcomp_cpu_dead);
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index d5eef65870380..cfc8c059db636 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -66,7 +66,7 @@ struct zram_table_entry {
unsigned long handle;
unsigned long element;
};
- unsigned long flags;
+ unsigned int flags;
spinlock_t lock;
#ifdef CONFIG_ZRAM_TRACK_ENTRY_ACTIME
ktime_t ac_time;
--
2.45.2
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