From: Peter Zijlstra <peterz@infradead.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Christoph Lameter <cl@linux.com>,
Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
vinmenon@codeaurora.org, shashim@codeaurora.org,
Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>,
dave@stgolabs.net, Konstantin Khlebnikov <koct9i@gmail.com>,
Linux Memory Management List <linux-mm@kvack.org>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work
Date: Mon, 30 Mar 2015 18:25:19 +0200 [thread overview]
Message-ID: <20150330162519.GB23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKohponEAivnev-fcWdjD0OcwQaXHN58tESCfqbZ_-W+_N+DvA@mail.gmail.com>
On Mon, Mar 30, 2015 at 09:47:01PM +0530, Viresh Kumar wrote:
> And all I get it is 8256 bytes, with or without the change.
Duh, rounded up to cacheline boundary ;-)
Trades two 4 byte holes at the start for a bigger 'hole' at the end.
struct tvec_base {
spinlock_t lock; /* 0 2 */
/* XXX 6 bytes hole, try to pack */
struct timer_list * running_timer; /* 8 8 */
long unsigned int timer_jiffies; /* 16 8 */
long unsigned int next_timer; /* 24 8 */
long unsigned int active_timers; /* 32 8 */
long unsigned int all_timers; /* 40 8 */
int cpu; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
struct tvec_root tv1; /* 56 4096 */
/* --- cacheline 64 boundary (4096 bytes) was 56 bytes ago --- */
struct tvec tv2; /* 4152 1024 */
/* --- cacheline 80 boundary (5120 bytes) was 56 bytes ago --- */
struct tvec tv3; /* 5176 1024 */
/* --- cacheline 96 boundary (6144 bytes) was 56 bytes ago --- */
struct tvec tv4; /* 6200 1024 */
/* --- cacheline 112 boundary (7168 bytes) was 56 bytes ago --- */
struct tvec tv5; /* 7224 1024 */
/* --- cacheline 128 boundary (8192 bytes) was 56 bytes ago --- */
/* size: 8256, cachelines: 129, members: 12 */
/* sum members: 8238, holes: 2, sum holes: 10 */
/* padding: 8 */
};
vs
struct tvec_base {
spinlock_t lock; /* 0 2 */
/* XXX 2 bytes hole, try to pack */
int cpu; /* 4 4 */
struct timer_list * running_timer; /* 8 8 */
long unsigned int timer_jiffies; /* 16 8 */
long unsigned int next_timer; /* 24 8 */
long unsigned int active_timers; /* 32 8 */
long unsigned int all_timers; /* 40 8 */
struct tvec_root tv1; /* 48 4096 */
/* --- cacheline 64 boundary (4096 bytes) was 48 bytes ago --- */
struct tvec tv2; /* 4144 1024 */
/* --- cacheline 80 boundary (5120 bytes) was 48 bytes ago --- */
struct tvec tv3; /* 5168 1024 */
/* --- cacheline 96 boundary (6144 bytes) was 48 bytes ago --- */
struct tvec tv4; /* 6192 1024 */
/* --- cacheline 112 boundary (7168 bytes) was 48 bytes ago --- */
struct tvec tv5; /* 7216 1024 */
/* --- cacheline 128 boundary (8192 bytes) was 48 bytes ago --- */
/* size: 8256, cachelines: 129, members: 12 */
/* sum members: 8238, holes: 1, sum holes: 2 */
/* padding: 16 */
};
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Christoph Lameter <cl@linux.com>,
Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
vinmenon@codeaurora.org, shashim@codeaurora.org,
Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>,
dave@stgolabs.net, Konstantin Khlebnikov <koct9i@gmail.com>,
Linux Memory Management List <linux-mm@kvack.org>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work
Date: Mon, 30 Mar 2015 18:25:19 +0200 [thread overview]
Message-ID: <20150330162519.GB23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKohponEAivnev-fcWdjD0OcwQaXHN58tESCfqbZ_-W+_N+DvA@mail.gmail.com>
On Mon, Mar 30, 2015 at 09:47:01PM +0530, Viresh Kumar wrote:
> And all I get it is 8256 bytes, with or without the change.
Duh, rounded up to cacheline boundary ;-)
Trades two 4 byte holes at the start for a bigger 'hole' at the end.
struct tvec_base {
spinlock_t lock; /* 0 2 */
/* XXX 6 bytes hole, try to pack */
struct timer_list * running_timer; /* 8 8 */
long unsigned int timer_jiffies; /* 16 8 */
long unsigned int next_timer; /* 24 8 */
long unsigned int active_timers; /* 32 8 */
long unsigned int all_timers; /* 40 8 */
int cpu; /* 48 4 */
/* XXX 4 bytes hole, try to pack */
struct tvec_root tv1; /* 56 4096 */
/* --- cacheline 64 boundary (4096 bytes) was 56 bytes ago --- */
struct tvec tv2; /* 4152 1024 */
/* --- cacheline 80 boundary (5120 bytes) was 56 bytes ago --- */
struct tvec tv3; /* 5176 1024 */
/* --- cacheline 96 boundary (6144 bytes) was 56 bytes ago --- */
struct tvec tv4; /* 6200 1024 */
/* --- cacheline 112 boundary (7168 bytes) was 56 bytes ago --- */
struct tvec tv5; /* 7224 1024 */
/* --- cacheline 128 boundary (8192 bytes) was 56 bytes ago --- */
/* size: 8256, cachelines: 129, members: 12 */
/* sum members: 8238, holes: 2, sum holes: 10 */
/* padding: 8 */
};
vs
struct tvec_base {
spinlock_t lock; /* 0 2 */
/* XXX 2 bytes hole, try to pack */
int cpu; /* 4 4 */
struct timer_list * running_timer; /* 8 8 */
long unsigned int timer_jiffies; /* 16 8 */
long unsigned int next_timer; /* 24 8 */
long unsigned int active_timers; /* 32 8 */
long unsigned int all_timers; /* 40 8 */
struct tvec_root tv1; /* 48 4096 */
/* --- cacheline 64 boundary (4096 bytes) was 48 bytes ago --- */
struct tvec tv2; /* 4144 1024 */
/* --- cacheline 80 boundary (5120 bytes) was 48 bytes ago --- */
struct tvec tv3; /* 5168 1024 */
/* --- cacheline 96 boundary (6144 bytes) was 48 bytes ago --- */
struct tvec tv4; /* 6192 1024 */
/* --- cacheline 112 boundary (7168 bytes) was 48 bytes ago --- */
struct tvec tv5; /* 7216 1024 */
/* --- cacheline 128 boundary (8192 bytes) was 48 bytes ago --- */
/* size: 8256, cachelines: 129, members: 12 */
/* sum members: 8238, holes: 1, sum holes: 2 */
/* padding: 16 */
};
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next prev parent reply other threads:[~2015-03-30 16:25 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 5:39 [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work Viresh Kumar
2015-03-26 5:39 ` Viresh Kumar
2015-03-26 20:18 ` Andrew Morton
2015-03-26 20:18 ` Andrew Morton
2015-03-27 4:49 ` Viresh Kumar
2015-03-27 4:49 ` Viresh Kumar
2015-03-27 9:16 ` Peter Zijlstra
2015-03-27 9:16 ` Peter Zijlstra
2015-03-27 9:30 ` Peter Zijlstra
2015-03-27 9:30 ` Peter Zijlstra
2015-03-27 11:11 ` Christoph Lameter
2015-03-27 11:11 ` Christoph Lameter
2015-03-27 12:02 ` Peter Zijlstra
2015-03-27 12:02 ` Peter Zijlstra
2015-03-27 19:45 ` Christoph Lameter
2015-03-27 19:45 ` Christoph Lameter
2015-03-28 4:28 ` Viresh Kumar
2015-03-28 4:28 ` Viresh Kumar
2015-03-28 11:41 ` Peter Zijlstra
2015-03-28 11:41 ` Peter Zijlstra
2015-03-28 4:18 ` Viresh Kumar
2015-03-28 4:18 ` Viresh Kumar
2015-03-28 9:53 ` Peter Zijlstra
2015-03-28 9:53 ` Peter Zijlstra
2015-03-28 11:57 ` viresh kumar
2015-03-28 11:57 ` viresh kumar
2015-03-28 12:04 ` Viresh Kumar
2015-03-28 12:04 ` Viresh Kumar
2015-03-28 13:44 ` Peter Zijlstra
2015-03-28 13:44 ` Peter Zijlstra
2015-03-29 10:24 ` Peter Zijlstra
2015-03-29 10:24 ` Peter Zijlstra
2015-03-30 12:02 ` Viresh Kumar
2015-03-30 12:02 ` Viresh Kumar
2015-03-30 12:47 ` Peter Zijlstra
2015-03-30 12:47 ` Peter Zijlstra
2015-03-30 13:14 ` Viresh Kumar
2015-03-30 13:14 ` Viresh Kumar
2015-03-30 13:59 ` Peter Zijlstra
2015-03-30 13:59 ` Peter Zijlstra
2015-03-30 16:17 ` Viresh Kumar
2015-03-30 16:17 ` Viresh Kumar
2015-03-30 16:25 ` Peter Zijlstra [this message]
2015-03-30 16:25 ` Peter Zijlstra
2015-03-29 12:01 ` Viresh Kumar
2015-03-29 12:01 ` Viresh Kumar
2015-03-29 17:24 ` Peter Zijlstra
2015-03-29 17:24 ` Peter Zijlstra
2015-03-30 15:08 ` Michal Hocko
2015-03-30 15:08 ` Michal Hocko
2015-03-30 15:14 ` Peter Zijlstra
2015-03-30 15:14 ` Peter Zijlstra
2015-03-30 15:42 ` Christoph Lameter
2015-03-30 15:42 ` Christoph Lameter
2015-03-27 14:19 ` Michal Hocko
2015-03-27 14:19 ` Michal Hocko
2015-03-28 4:34 ` Viresh Kumar
2015-03-28 4:34 ` Viresh Kumar
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